feat: support attribute-based routing for manually assigned members

[weknowyourgame]

What does this PR do?

• Fixes #21483
• Fixes CAL-5816

Mandatory Tasks (DO NOT REMOVE)

• [x] I have self-reviewed the code (A decent size PR without self-review might be rejected).
• [x] I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• [x] I confirm automated tests are in place that prove my fix is effective or that my feature works.

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Summary by cubic

Added support for attribute-based (segment) routing when team members are manually assigned, not just when all team members are selected.

• New Features
  • Users can now enable segment routing for specific, manually assigned team members.
  • Updated UI and tests to support this new assignment flow.

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[graphite-app[bot]]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (06/13/25)

1 reviewer was added to this PR based on Keith Williams's automation.

"Add community label" took an action on this PR • (06/13/25)

1 label was added to this PR based on Keith Williams's automation.

[kart1ka]

Hey @weknowyourgame. Thanks for the PR. Could you please add a Loom video of the feature?

[Devanshusharma2005]

hey @weknowyourgame thanks for the pr. Closing this due to inactivity. Feel free to reopen.