[release/8.0-staging] Fix FormatQuantiles formatting in MetricsEventSource

[github-actions]

Backport of #98699 to release/8.0-staging

/cc @stephentoub

Customer Impact

• Customer reported
• Found internally

dotnet counters displays corrupted values when the application being monitored is running under certain cultures, like Finnish (Finland).

Regression

• Yes
• No

Regression introduced in .NET 8 as part of changes to add CompositeFormat. A line was erroneously changed to remove using the invariant culture when formatting a string and instead use the current culture.

Testing

New tests were added to validate the metrics event source is appropriately outputting the expected data under various cultures.

Risk

Low. The code was effectively restored to what it was previously using invariant culture instead of current culture.

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Issue Details

---

Backport of #98699 to release/8.0-staging

/cc @stephentoub

Customer Impact

• Customer reported
• Found internally

[Select one or both of the boxes. Describe how this issue impacts customers, citing the expected and actual behaviors and scope of the issue. If customer-reported, provide the issue number.]

Regression

• Yes
• No

[If yes, specify when the regression was introduced. Provide the PR or commit if known.]

Testing

[How was the fix verified? How was the issue missed previously? What tests were added?]

Risk

[High/Medium/Low. Justify the indication by mentioning how risks were measured and addressed.]

IMPORTANT: If this backport is for a servicing release, please verify that:

• The PR target branch is release/X.0-staging, not release/X.0.

• If the change touches code that ships in a NuGet package, you have added the necessary package authoring and gotten it explicitly reviewed.

Author:	github-actions[bot]
Assignees:	-
Labels:	area-System.Diagnostics.Tracing
Milestone:	-

[tarekgh]

@stephentoub please ensure adding the package authoring to this change.

package authoring

CC @ericstj @carlossanlop

[ericstj]

I went ahead and added the servicing changes with the web editor.

[carlossanlop]

Friendly reminder that Monday March 11th is the Code Complete date for the April Release. This PR still needs the package authoring changes requested above.

[stephentoub]

This PR still needs the package authoring changes requested above.

Is that different from what @ericstj added already?

[carlossanlop]

My bad. It's ready to merge then.

[stephentoub]

Build Analysis is red. I don't think those test failures are related to this, but can you confirm you've seen those same failures on other 8.0-staging PRs?

[carlossanlop]

You read my mind. I was seeing that failure in other PRs and opened this issue to track it: #99378

I re-ran Build Analysis here and now most of them got grouped under that issue.

The other failures also had an issue open but the json was not getting detected correctly, so I edited it: #90639

[stephentoub]

Ok, thanks.