Issue #3439981: Add unit test to check the theme registry is not reset when an...

Issue #3439981: Add unit test to check the theme registry is not reset when an image style flushes a specific path

Closes #3439981

added 195 commits

• 01dfef9a...bfaae1b1 - 193 commits from branch project:11.x
• 2e25d079 - Issue #3439981: Do not flush theme registry when uploading a file to media library.
• e29617dc - Issue #3439981: Add unit test to check the theme registry is not reset when an...

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