[release/9.0-preview4] Revert "Make mutable generic collection interfaces implement read-only collection interfaces (#95830)"

[github-actions]

Backport of #101644 to release/9.0-preview4

/cc @jkotas

Customer Impact

• Customer reported
• Found internally

This change introduces ambiguous call error for calls of IList.Count in C++/CLI.

dotnet/wpf#9055 (comment)

Regression

• Yes
• No

#95830

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.

[ghost]

Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

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