The GitHub Actions job "Build and push images" on texera.git/main has failed.
Run started by GitHub user bobbai00 (triggered by bobbai00).

Head commit for run:
b9fc0d2c89423ea76ffda3948f9a3688fb4849ce / Seongjin Yoon 
<[email protected]>
fix(backend): allow users with read access level to revoke their own access on 
shared workflows (#4143)

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### What changes were proposed in this PR?
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This PR fixes a permission issue where users with READ access to a
workflow could not revoke their own access.

**Changes:**
- Updated `revokeAccess()` method in `WorkflowAccessResource.scala` to
allow users to revoke their own access regardless of privilege level
(READ or WRITE).
- Added owner protection which prevents workflow owners from revoking
their own access to avoid orphaned workflows.
- Added test cases for the `revokeAccess()` method in
`WorkflowAccessResourceSpec.scala`.

**Before:**
- Backend requires WRITE privilege for self-revocation.
- READ users received error when revoking their own access.

**After:**
- READ users can revoke their own access to a shared workflow (leave
shared workflows).
- Owners cannot revoke their own access (prevent orphaned workflows).

**Demo:**


https://github.com/user-attachments/assets/4fa57eb0-9218-4715-bf8d-aec26f039174

### Any related issues, documentation, discussions?
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Fixes #4141.

### How was this PR tested?
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Run `sbt "WorkflowExecutionService/testOnly
*WorkflowAccessResourceSpec"`

**The test cases cover the following scenarios:**
- Users with WRITE access can revoke other users' access.
- Users with READ access cannot revoke other users' access.
- Users can revoke their own access regardless of access level.
- Owner's access cannot be revoked by others.
- Owner cannot revoke their own access.
- Error handling for non-existing users.
- Revoking access does not affect other users' access level.
- Revoke access of a user who does not have access.

### Was this PR authored or co-authored using generative AI tooling?
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No.

Report URL: https://github.com/apache/texera/actions/runs/20839315758

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