Revert "[vm/tests] Re-enable tests for multiple entry points"

This reverts commit 00eb034de749848197e72b5cdfd4259570f269fd.

Reason for revert: test failure on vm-kernel-optcounter-threshold-linux-release-x64 bot

Original change's description:
> [vm/tests] Re-enable tests for multiple entry points
> 
> Closes https://github.com/dart-lang/sdk/issues/37144
> 
> Change-Id: I9935db44cf01dda106c9211978dca33aac7fcb16
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/109551
> Reviewed-by: Ryan Macnak <rmacnak@google.com>
> Commit-Queue: Alexander Markov <alexmarkov@google.com>

TBR=rmacnak@google.com,alexmarkov@google.com,sjindel@google.com

Change-Id: I582c014c4e02216be1575609aa950e8afb7e0702
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/109600
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>