Improve "flux resume" error message on non-existent object

[sjorsholtrop-ritense]

Currently, doing a resume operation on non-existent objects, e.g.

flux resume helmrelease foo bar baz

results in the error:

✗ no HelmRelease objects found in flux-system namespace
✗ no HelmRelease objects found in flux-system namespace
✗ no HelmRelease objects found in flux-system namespace

This message could be more helpful. Additionally, when resuming only a single resource, the error message is slightly misleading as there might exist HelmRelease objects, just not the ones your provided.

With this PR, the output would become:

✗ HelmRelease object 'foo' not found in flux-system namespace
✗ HelmRelease object 'bar' not found in flux-system namespace
✗ HelmRelease object 'baz' not found in flux-system namespace

This error message is more descriptive and follows the same format as the one in cmd/flux/get.go:187.

[matheuscscp]

@sjorsholtrop-ritense Please sign the commit with git commit -s so I can approve the workflows to run

[sjorsholtrop-ritense]

@sjorsholtrop-ritense Please sign the commit with git commit -s so I can approve the workflows to run

Done!

[matheuscscp]

@sjorsholtrop-ritense

=== RUN   TestHelmReleaseFromGit
    main_test.go:356: Mismatch from golden file 'testdata/helmrelease/resume_helmrelease_from_git.golden': Mismatch from expected value (-want +got):
          (
          	"""
        - 	► resuming helmrelease thrfg in thrfg-1 namespace
        - 	✔ helmrelease resumed
        - 	◎ waiting for HelmRelease reconciliation
        - 	✔ HelmRelease thrfg reconciliation completed
        - 	✔ applied revision 6.3.5
        + 	✗ HelmRelease object 'thrfg' not found in thrfg-1 namespace
          	"""
          )

[matheuscscp]

@sjorsholtrop-ritense the file from the diff I posted above is testdata/helmrelease/resume_helmrelease_from_git.golden

[sjorsholtrop-ritense]

@sjorsholtrop-ritense the file from the diff I posted above is testdata/helmrelease/resume_helmrelease_from_git.golden

I see. I was checking the list before resources were fetched. It should be fixed now.

[matheuscscp]

Thanks @sjorsholtrop-ritense !