[Sema] Revert enabling require-explicit-availability for public modules by default #61161
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This is a partial revert of #61105. Passing the flag
-require-explicit-availability=ignore
to the stdlib broke the bot building the stdlib with the last toolchain. We should wait until the flag is available in a toolchain on swift.org before we adopt it in the stdlib. Until we can use the flag, to avoid misleading warnings in the stdlib I'm also reverting the automatic enabling of require-explicit-availability for public modules.rdar://99993044