RFR: 1851: Fold CSR bot into PR bot

Mon Mar 27 22:24:25 UTC 2023

In this patch, the whole csr bot module is removed. 

Original CSRPullRequestBot is deleted. The functionality of this bot has been moved to `CheckRun`.

Original CSRIssueBot has been moved to pr bot module. PullRequestBotFactory would generate a CSRIssueBot for every configured Issue project.

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Commit messages:
 - SKARA-1851

Changes: https://git.openjdk.org/skara/pull/1492/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1492&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1851
  Stats: 2582 lines in 22 files changed: 1006 ins; 1534 del; 42 mod
  Patch: https://git.openjdk.org/skara/pull/1492.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1492/head:pull/1492

PR: https://git.openjdk.org/skara/pull/1492