Fix Infinite loop on OdbcDataReader.internalGetString with UTF-8 text

[MohamedChaawa]

Fix Infinite loop on OdbcDataReader.internalGetString with UTF-8 text.

When the lengthOrIndicator is 0 the loop should be broken.
This change fixes the issue #86490

[stephentoub]

Is it possible to add a test for this?

[MohamedChaawa]

@dotnet-policy-service agree

[MohamedChaawa]

Is it possible to add a test for this?

@stephentoub OdbcDataReaderTests is added.

[stephentoub]

Thanks.

I pulled down your change and tried running the test without the fix, and it still passes.

Is this test validating what you expect it to validate?

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