Resource masking fixes

[JamesNK]

Description

Bug repo:

1. View project details
2. Click show value for an env var
3. Restart project
4. Refreshed project details show values for all env vars

PR improves how state is tracked and updated. Adds integration tests.

Fixes #6557

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Is this introducing a breaking change?
      • Yes
        • Link to aspire-docs issue (please use this breaking-change template):
      • No
        • Link to aspire-docs issue (please use this doc-idea template):
  • No

[JamesNK]

/backport to release/9.0

[github-actions]

Started backporting to release/9.0: https://github.com/dotnet/aspire/actions/runs/11965753843

[github-actions]

@JamesNK backporting to release/9.0 failed, the patch most likely resulted in conflicts:

$ git am --3way --empty=keep --ignore-whitespace --keep-non-patch changes.patch

Applying: Resource masking fixes
Using index info to reconstruct a base tree...
M	src/Aspire.Dashboard/Components/Controls/GridValue.razor
M	src/Aspire.Dashboard/Components/Controls/PropertyGrid.razor
M	src/Aspire.Dashboard/Components/Controls/PropertyGrid.razor.cs
M	src/Aspire.Dashboard/Components/Controls/ResourceDetails.razor
Falling back to patching base and 3-way merge...
Auto-merging src/Aspire.Dashboard/Components/Controls/ResourceDetails.razor
CONFLICT (content): Merge conflict in src/Aspire.Dashboard/Components/Controls/ResourceDetails.razor
Auto-merging src/Aspire.Dashboard/Components/Controls/PropertyGrid.razor.cs
CONFLICT (content): Merge conflict in src/Aspire.Dashboard/Components/Controls/PropertyGrid.razor.cs
Auto-merging src/Aspire.Dashboard/Components/Controls/PropertyGrid.razor
Auto-merging src/Aspire.Dashboard/Components/Controls/GridValue.razor
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 Resource masking fixes
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!

[github-actions]

@JamesNK an error occurred while backporting to release/9.0, please check the run log for details!

Error: git am failed, most likely due to a merge conflict.