DYN-6411 Only package authors able to publish a version of a package

[ivaylo-matov]

Purpose

Publish version is now greyed out if the user is not the author or maintainer of the package.

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

Publish version is now greyed out if the user is not the author or maintainer of the package.

Reviewers

@dnenov
@reddyashish

FYIs

@Amoursol

[github-actions]

UI Smoke Tests

Test: success. 2 passed, 0 failed.
TestComplete Test Result
Workflow Run: UI Smoke Tests
Check: UI Smoke Tests - net8.0

[Amoursol]

This looks awesome @ivaylo-matov 🙌 Thanks so much for doing this.