Enable required check status for PR validation

[RobertIndie]

Motivation

Currently, there is no required workflow for the PR.

Modifications

Enable required check status for pr validation

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)

[BewareMyPower]

Could you take a look at the Build Alpine Linux APK Package task? It stuck at Waiting for status to be reported

[BewareMyPower]

In addition, these two tasks (especially the most important unit tests task) are not required.

[RobertIndie]

In addition, these two tasks (especially the most important unit tests task) are not required.

Where is this PR? I found that there is no CentOS7 matrix in the CI job:

pulsar-client-cpp/.github/workflows/ci-pr-validation.yaml

Lines 88 to 101 in b6653d6

	- name: 'Windows x64'
	os: windows-2022
	triplet: x64-windows
	vcpkg_dir: 'C:\vcpkg'
	suffix: 'windows-win64'
	generator: 'Visual Studio 17 2022'
	arch: '-A x64'
	- name: 'Windows x86'
	os: windows-2022
	triplet: x86-windows
	vcpkg_dir: 'C:\vcpkg'
	suffix: 'windows-win32'
	generator: 'Visual Studio 17 2022'
	arch: '-A Win32'

Did you add the new matrix in your PR?

The unit test is dependent by other jobs.

But I'm OK to add it as a required job.

[BewareMyPower]

I found that there is no CentOS7 matrix in the CI job:

Because it was removed in #25.