Default to browser token auth in dashboard standalone

[JamesNK]

Based on offline discussion, I've changed dashboard standalone to the default to browser token auth. Also, I noticed a number of bugs in dashboard standalone mode related to browser token auth. They're fixed in this PR.

This PR:

• Changes dashboard to default to browser token auth in the frontend, and unsecured in OTLP endpoint
• Displays a warning about the unsecured OTLP endpoint in the console and in the UI with a message bar
• Fixes the browser token being generated multiple times
• Fixes the addresses written to the console to be the first address (matches host) instead of the last address
• Fixes the addresses written to the console to be localhost if localhost is specified.

Demo:

Microsoft Reviewers: Open in CodeFlow

[davidfowl]

Very nice! Lets get this in for GA.

[davidfowl]

Left feedback

[JamesNK]

/backport to release/8.0

[github-actions]

Started backporting to release/8.0: https://github.com/dotnet/aspire/actions/runs/8592957835

[github-actions]

@JamesNK backporting to release/8.0 failed, the patch most likely resulted in conflicts:

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

Applying: Default to browser token auth in dashboard standalone
.git/rebase-apply/patch:359: trailing whitespace.
        
.git/rebase-apply/patch:368: trailing whitespace.
        
.git/rebase-apply/patch:377: trailing whitespace.
        
warning: 3 lines add whitespace errors.
Using index info to reconstruct a base tree...
M	src/Aspire.Dashboard/DashboardWebApplication.cs
M	src/Aspire.Dashboard/wwwroot/css/app.css
M	tests/Aspire.Dashboard.Tests/Integration/StartupTests.cs
Falling back to patching base and 3-way merge...
Auto-merging tests/Aspire.Dashboard.Tests/Integration/StartupTests.cs
CONFLICT (content): Merge conflict in tests/Aspire.Dashboard.Tests/Integration/StartupTests.cs
Auto-merging src/Aspire.Dashboard/wwwroot/css/app.css
Auto-merging src/Aspire.Dashboard/DashboardWebApplication.cs
CONFLICT (content): Merge conflict in src/Aspire.Dashboard/DashboardWebApplication.cs
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Default to browser token auth in dashboard standalone
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!

[github-actions]

@JamesNK an error occurred while backporting to release/8.0, please check the run log for details!

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