Show opt-in region in topbar dropdown only if PCM is deployed in it

[tmscarla]

Description

Currently PCM displays the full list of regions supported by PC in its topbar dropdown menu. If an opt-in region is selected, and the account where PCM is deployed has not opted-in yet for the selected region, a series of errors is thrown on the frontend.

This PR aims to prevent these errors from being thrown by showing opt-in regions in topbar dropdown only if PCM is deployed in it. In the attached example PCM has been deployed in an opt-in region (Milan, eu-south-1) which is shown at the top of the list.

Changelog entry

• Prevent frontend errors by showing opt-in regions in topbar dropdown only if PCM is deployed in it

How Has This Been Tested?

1. Opted-in eu-south-1 region in my personal account where PCM is deployed
2. Verified that eu-south-1 region is displayed at the top of the regions list

References

• PC supported regions
• AWS Opt-in regions

PR Quality Checklist

• [ ] I added tests to new or existing code
• [ ] I removed hardcoded strings and used our i18n solution instead (see here)
• [ ] I made sure no sensitive info gets logged at any time in the codebase (see here) (e.g. no user info or details, no stacktraces, etc.)
• [ ] I checked that infrastructure/update_infrastructure.sh runs without any error
• [x] I checked that npm run build builds without any error
• [x] I checked that clusters are listed correctly
• [ ] I checked that a new cluster can be created (config is produced and dry run passes)
• [x] I checked that login and logout work as expected

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