Release v1.4.4

[WizardXiao]

This is an issue tracking the tidb-operator v1.4.4 release.

Previous:

• Release v1.4.3 #4900

Pending PRs:

TODO:

• All PRs is cherry-picked to release-1.4 dp: cherry pick dp prs to release-1.4 #4929
• Update default version of TiDB Operator bump operator version to 1.4.4 #4930
• Update TiDB version and tools (may include DM) version if necessary
  • no need
• Update the TiDB version and tools version in docs-tidb-operator repo
  • no need
• Update release notes en,zh: release note for 1.4.4 docs-tidb-operator#2261
• Update Github Releases
• Build and publish docker images/helm charts https://cd.pingcap.net/job/release-tidb-operator/53/
• Announcement (slack, email, etc.)
• Update TiDB Operator version in docs-tidb-operator repo (both for dev and stable branch) en,zh: bump operator to v1.4.4 docs-tidb-operator#2264 en,zh: bump operator to v1.4.4 for release-1.4  docs-tidb-operator#2263