Add Auto Complete functionality to associate feature flag with contextual issue

Problem to solve

Once we deliver #26456 (closed), we can make associating feature flags to issues easier by offering auto-complete functionality

Intended users

• Sidney, Systems Administrator, https://design.gitlab.com/research/personas#persona-sidney
• Product Manager (or others who are setting or need to know the state of feature flags)

Further details

Proposal

Associate a feature flag on issues by mentioning

• Mentions can be made using the ^ symbol
• Issues can be added by mentioning/linking in the feature flag description
• When editing description/comment entering ^ should bring up an autocomplete list with available feature flags.

This should happen on the description of feature flags screen and also on the issues screen

TODOS:

• 1 for autocomplete on the description of the Feature Flags (mentioning issues)
• 1 for autocomplete in issues (mentioning feature flags)

Permissions and Security

Documentation

Availability & Testing

What does success look like, and how can we measure that?

What is the type of buyer?

Is this a cross-stage feature?

Links / references

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