Decouple context lifetime before gateway IDs unclaim

[adriansmares]

Summary

Closes #3840

Changes

• On Component.FromRequestContext, keep the context values in the new context, but use the lifetime of the component.
• Use FromRequestContext before UnclaimIDs and UnclaimDownlink.

Testing

Unit testing.

Regressions

Not expected.

Notes for Reviewers

This implementation for FromRequestContext should land in TTSE as well.

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.

[htdvisser]

LGTM