[jdk21] RFR: 8300051: assert(JvmtiEnvBase::environments_might_exist()) failed: to enter event controller, JVM TI environments must exist

[Serguei Spitsyn]

This is a clean 21 backport of the 22 fix:
  [JDK-8300051](https://bugs.openjdk.org/browse/JDK-8300051): assert(JvmtiEnvBase::environments_might_exist()) failed: to enter event controller, JVM TI environments must exist

Testing:
 - TBD: mach5 tiers 1-5

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Commit messages:
 - Backport 783de32b6af4383b5ba71b91c307a5dddd0dae13

Changes: https://git.openjdk.org/jdk21/pull/143/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=143&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300051
  Stats: 26 lines in 2 files changed: 14 ins; 12 del; 0 mod
  Patch: https://git.openjdk.org/jdk21/pull/143.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/143/head:pull/143

PR: https://git.openjdk.org/jdk21/pull/143