[BUG] Build failed on 2.x branch

[ruanyl]

What is the bug?

dashboards-maps git:(2.x) yarn build
yarn run v1.22.19
$ yarn plugin-helpers build
$ node ../../scripts/plugin_helpers build
 info Loaded config file from [/Users/ruanyl/project/OpenSearch-Dashboards-latest/plugins/dashboards-maps/.opensearch_dashboards-plugin-helpers.json]
 info deleting the build and target directories
 info running @osd/optimizer
 │ info initialized, 0 bundles cached
 │ info starting worker [1 bundle]
 │ERROR webpack compile errors
     │ERROR [customImportMapDashboards] build
         │ERROR Optimizations failure.
         │         1 module
         │
         │          ERROR in /Users/ruanyl/project/OpenSearch-Dashboards-latest/packages/osd-optimizer/target/worker/entry_point_creator.js
         │          Module build failed (from /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/babel-loader/lib/index.js):
         │          Error: Cannot find module '@babel/plugin-proposal-class-properties'
         │          Require stack:
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/plugins/dashboards-maps/babel.config.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/@babel/core/lib/config/files/module-types.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/@babel/core/lib/config/files/configuration.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/@babel/core/lib/config/files/index.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/@babel/core/lib/index.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/babel-loader/lib/index.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/loader-runner/lib/loadLoader.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/loader-runner/lib/LoaderRunner.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/webpack/lib/NormalModule.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/webpack/lib/NormalModuleFactory.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/webpack/lib/Compiler.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/webpack/lib/webpack.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/packages/osd-optimizer/target/worker/run_compilers.js
         │          - /Users/ruanyl/project/OpenSearch-Dashboards-latest/packages/osd-optimizer/target/worker/run_worker.js
         │              at Function.Module._resolveFilename (node:internal/modules/cjs/loader:1075:15)
         │              at Function.Module._load (node:internal/modules/cjs/loader:920:27)
         │              at Module.require (node:internal/modules/cjs/loader:1141:19)
         │              at require (node:internal/modules/cjs/helpers:110:18)
         │              at Object.<anonymous> (/Users/ruanyl/project/OpenSearch-Dashboards-latest/plugins/dashboards-maps/babel.config.js:13:5)
         │              at Module._compile (node:internal/modules/cjs/loader:1254:14)
         │              at Object.Module._extensions..js (node:internal/modules/cjs/loader:1308:10)
         │              at Module.load (node:internal/modules/cjs/loader:1117:32)
         │              at Function.Module._load (node:internal/modules/cjs/loader:958:12)
         │              at Module.require (node:internal/modules/cjs/loader:1141:19)
         │              at require (node:internal/modules/cjs/helpers:110:18)
         │              at loadPartialConfigAsync (/Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/@babel/core/src/config/index.ts:44:61)
         │              at Object.<anonymous> (/Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/babel-loader/lib/index.js:155:26)
         │              at Generator.next (<anonymous>)
         │              at asyncGeneratorStep (/Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/babel-loader/lib/index.js:3:103)
         │              at _next (/Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/babel-loader/lib/index.js:5:194)
         │              at /Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/babel-loader/lib/index.js:5:364
         │              at new Promise (<anonymous>)
         │              at Object.<anonymous> (/Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/babel-loader/lib/index.js:5:97)
         │              at Object._loader (/Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/babel-loader/lib/index.js:245:18)
         │              at Object.loader (/Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/babel-loader/lib/index.js:64:18)
         │              at Object.<anonymous> (/Users/ruanyl/project/OpenSearch-Dashboards-latest/node_modules/babel-loader/lib/index.js:59:12)
 │ERROR webpack issue

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[ryanbogan]

Addressed in #574