[jdk21u-dev] RFR: 8342075: HttpClient: improve HTTP/2 flow control checks [v2]

[Alexey Bakhtin]

> Please review the backport of JDK-8342075
> 
> Almost clean backport except for the import section of src/java.net.http/share/classes/jdk/internal/net/http/Http2Connection.java
> 
> All jtreg tests for java.net.httpclient are passed

Alexey Bakhtin has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/1427/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/1427/files/d69829e8..d69829e8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1427&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1427&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1427.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1427/head:pull/1427

PR: https://git.openjdk.org/jdk21u-dev/pull/1427