[improve][misc] Add IssueNavigationLink for IDEA git log

[alpreu]

Motivation

This enables GitHub hyperlinks in IDEA for commits containing PR information.
Clicking on the link will directly open the corresponding GitHub PR.
See screenshots below:
NOW

BEFORE

Modifications

• changed .gitignore
• added vcs.xml IDEA file

Verifying this change

• Make sure that the change passes the CI checks.

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The binary protocol
• The REST endpoints
• The admin CLI options
• Anything that affects deployment

Documentation

• doc-required
  (Your PR needs to update docs and you will update later)

• doc-not-needed
  (Please explain why)

• doc
  (Your PR contains doc changes)

• doc-complete
  (Docs have been already added)

Matching PR in forked repository

PR in forked repository: <!-- ENTER URL HERE

After opening this PR, the build in apache/pulsar will fail and instructions will
be provided for opening a PR in the PR author's forked repository.

apache/pulsar pull requests should be first tested in your own fork since the
apache/pulsar CI based on GitHub Actions has constrained resources and quota.
GitHub Actions provides separate quota for pull requests that are executed in
a forked repository.

The tests will be run in the forked repository until all PR review comments have
been handled, the tests pass and the PR is approved by a reviewer.

-->

[github-actions]

The pr had no activity for 30 days, mark with Stale label.