RFR: 8098: Remove obsolete checkformatting step in GHA

Thu Jun 29 16:23:28 UTC 2023

spotless is integrated into the standard JMC build workflow now. So we can skip the separate checkformatting step in GHA.

I also fixed indentation in updatecopyrightyear.sh.

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Commit messages:
 - JMC-8098

Changes: https://git.openjdk.org/jmc/pull/504/files
 Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=504&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8098
  Stats: 45 lines in 4 files changed: 0 ins; 27 del; 18 mod
  Patch: https://git.openjdk.org/jmc/pull/504.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/504/head:pull/504

PR: https://git.openjdk.org/jmc/pull/504