chore: adjust for net10 (backport #1845)

[mergify]

This pull request updates the default .NET target version for Uno templates and related CI infrastructure from .NET 9.0 to .NET 10.0. It also removes preview labels from .NET 10.0 descriptions and makes minor adjustments to CI scripts and bootstrapper versions to align with .NET 10.0 support.

Template updates:

• Changed the default target framework to net10.0 in all Uno templates (unoapp, unolib, unolib-uitest, unomauilib) and updated descriptions to remove the "Preview" label for .NET 10.0. (F1fe99c3L22R22, [1] [2] [3] [4] [5] [6] [7]

• Updated a template condition for net10.0 in unoapp so that the value is now set to false instead of true.

CI and build infrastructure:

• Updated the .NET 10 version used in CI scripts to 10.0.100 (removing the release candidate suffix) and set the unocheckArguments to an empty string for .NET 10 test groups. [1] [2]

• Added a TODO comment to the UnoWasmBootstrapVersionNet10 property and similar TODOs to environment variables for UnoCheck versions, indicating these should be updated when stable versions are released. [1] [2]

  ---

  This is an automatic backport of pull request chore: adjust for net10 #1845 done by Mergify.

[mergify]

Cherry-pick of 15bbfba has failed:

On branch mergify/bp/release/stable/6.4/pr-1845
Your branch is up to date with 'origin/release/stable/6.4'.

You are currently cherry-picking commit 15bbfba.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .github/actions/ci/generate-test-matrix/action.yml
	modified:   .github/actions/ci/run-tests/action.yml
	modified:   .github/workflows/ci.yml
	modified:   src/Uno.Templates/content/unoapp/.template.config/template.json
	modified:   src/Uno.Templates/content/unolib-uitest/.template.config/template.json
	modified:   src/Uno.Templates/content/unolib/.template.config/template.json
	modified:   src/Uno.Templates/content/unomauilib/.template.config/template.json

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   src/Uno.Sdk.Updater.targets

Cherry-pick of 29a2454 has failed:

On branch mergify/bp/release/stable/6.4/pr-1845
Your branch is ahead of 'origin/release/stable/6.4' by 3 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 29a2454.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .github/workflows/ci.yml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   src/Uno.Sdk.Updater.targets

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally