feat(dataset): add dataset contributor display and editing

[xuang7]

What changes were proposed in this PR?

This PR adds the frontend support for dataset contributor metadata so that dataset authors and other contributors can be properly acknowledged.

Changes:

• Adds a Contributorssection to the dataset detail page.
• Displays contributors as cards.
• Supports adding, editing, and removing contributors through a modal editor.
• Restricts contributor updates to users with WRITE access.
• Uses optimistic updates and rolls back changes if saving fails.
• Adds an optional contributors form to the dataset creation flow.
• Truncates long field values and displays the full content in tooltips.
• Validates contributor email addresses.

Demo

Create a dataset with contributor metadata	Add a contributor from the dataset detail page

Add a contributor and view long field values

add-contributor.mov

Remove a contributor

remove-contributor.mov

Any related issues, documentation, discussions?

Depends on #6952
Closes #6926

How was this PR tested?

Added frontend test cases for the contributor editor, dataset detail flows, service requests, and email validation. The flow was also manually tested in the UI.

Was this PR authored or co-authored using generative AI tooling?

Generated-by: Claude Code (Claude Fable 5)

[github-actions]

Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @rbelavadi, @aglinxinyuan, @mengw15
  You can notify them by mentioning @rbelavadi, @aglinxinyuan, @mengw15 in a comment.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 69.44444% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.97%. Comparing base (bfe2b53) to head (2c2a3b3).

Files with missing lines	Patch %	Lines
...ser-dataset-explorer/dataset-detail.component.html	45.09%	27 Missing and 1 partial ⚠️
.../user-dataset-explorer/dataset-detail.component.ts	82.75%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6953      +/-   ##
============================================
- Coverage     78.99%   78.97%   -0.03%     
  Complexity     3789     3789              
============================================
  Files          1160     1162       +2     
  Lines         46105    46213     +108     
  Branches       5115     5126      +11     
============================================
+ Hits          36420    36495      +75     
- Misses         8067     8096      +29     
- Partials       1618     1622       +4     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.00% <ø> (ø)		Carriedforward from bfe2b53
agent-service	76.76% <ø> (ø)		Carriedforward from bfe2b53
amber	72.21% <ø> (ø)		Carriedforward from bfe2b53
computing-unit-managing-service	20.49% <ø> (ø)		Carriedforward from bfe2b53
config-service	66.66% <ø> (ø)		Carriedforward from bfe2b53
file-service	67.21% <ø> (ø)		Carriedforward from bfe2b53
frontend	82.92% <69.44%> (-0.08%)	⬇️
notebook-migration-service	78.94% <ø> (ø)		Carriedforward from bfe2b53
pyamber	95.38% <ø> (ø)		Carriedforward from bfe2b53
workflow-compiling-service	26.31% <ø> (ø)		Carriedforward from bfe2b53

*This pull request uses carry forward flags. Click here to find out more.

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