[Clipboard] Divided selective format test to reduce test time

Since there were too many test in 1 test file, its execution time was
around 7-8 seconds which made it flaky.
Divided tests in 4 file to reduce execution time.

Bug: 448666461, 448312276
Change-Id: I9b7a99fbef226a49fe925edca51538af760bb7ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7005887
Reviewed-by: Rohan Raja <roraja@microsoft.com>
Commit-Queue: Shweta Bindal <shwetabindal@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1527652}