RFR: 8356226: JCov Grabber server didn't respond

[Alexandre Iline]

Fix is to allow bigger XML files.

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Commit messages:
 - Also fix reports
 - JDK-8356226: JCov Grabber server didn't respond

Changes: https://git.openjdk.org/jdk/pull/25056/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25056&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356226
  Stats: 12 lines in 1 file changed: 6 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/25056.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25056/head:pull/25056

PR: https://git.openjdk.org/jdk/pull/25056