mysql-shell: add user_agent

[samford]

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The asset URL for mysql-shell is correct but the download appears to fail with the default user agent as well as user_agent: :fake (or :browser). It does appear to work with user_agent: "curl/8.7.1", as used in a few other casks.

Fixes #200164.

[samford]

Oh joy, the livecheck block URL is broken on CI for the same reason 😭

[For context, livecheck doesn't support manually setting the user agent yet. I have the feature implemented but I'm working through some related Utils::Curl changes first.]

If the livecheck block works locally for others, we can just skip livecheck on CI for now.

[khipp]

Would whitelisting the URLs in the secure_connection_audit_skiplist.json help? We did this with the tableau casks, which also had 403 errors.

[samford]

Would whitelisting the URLs in the secure_connection_audit_skiplist.json help?

I gave it a shot but this situation appears to be different.

Edit: Oh wait, looks like it works if we add both the homepage and livecheck URL (and it helps if I type the JSON without syntax errors 😆).

[khipp]

Glad I could help!