Use TransparentCompiler cache for GetProjectOptionsFromScript

[nojaf]

Description

This invokes the GetProjectSnapshotFromScript call from GetProjectOptionsFromScript so the load script closure is properly cached in the Transparent Compiler.

@0101 I've exposed the item count from AsyncMemoize, this seems slightly more convenient than the event route. I don't have a strong preference on this, so let me know if you wish to see this differently.

Checklist

• Test cases added

• Performance benchmarks added in case of performance changes

• Release notes entry updated:

  Please make sure to add an entry with short succinct description of the change as well as link to this pull request to the respective release notes file, if applicable.

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  Information about the release notes entries format can be found in the documentation.
  Example:

  • More inlines for Result module. (PR #16106)
  • Correctly handle assembly imports with public key token of 0 length. (Issue #16359, PR #16363)
    *while! (Language suggestion #1038, PR #14238)

  If you believe that release notes are not necessary for this PR, please add NO_RELEASE_NOTES label to the pull request.

[github-actions]

❗ Release notes required

@nojaf,

Caution

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Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/8.0.300.md	No release notes found or release notes format is not correct