Should also support upper-case README files #20581
Merged
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Address the issue introduced in #20508 (79741dd), also added some case in existing test that cover this issue.
IsReadmeFileExtensiononly match the lower-casereadmefile, and also require the extensions use the same caption case as the provided ones, soREADME.mdandreadme.MDwill no longer be supported. After this patch, it will be once again become supported.