[AIRFLOW-6821] - Success callback not called when task marked as succ…

[saurabhdhupar]

…ess from UI

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Issue link: AIRFLOW-6821

Make sure to mark the boxes below before creating PR: [x]

• [ x] Description above provides context of the change
• [ x] Commit message/PR title starts with [AIRFLOW-NNNN]. AIRFLOW-NNNN = JIRA ID^*
• [x ] Unit tests coverage for changes (not needed for documentation changes)
• [x ] Commits follow "How to write a good git commit message"
• [ x] Relevant documentation is updated including usage instructions.
• [x ] I will engage committers as explained in Contribution Workflow Example.

^* For document-only changes commit message can start with [AIRFLOW-XXXX].

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In case of fundamental code change, Airflow Improvement Proposal (AIP) is needed.
In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
In case of backwards incompatible changes please leave a note in UPDATING.md.
Read the Pull Request Guidelines for more information.

[codecov-io]

Codecov Report

Merging #7447 into master will increase coverage by 53.41%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master    #7447       +/-   ##
===========================================
+ Coverage   32.95%   86.36%   +53.41%     
===========================================
  Files         878      878               
  Lines       41219    41222        +3     
===========================================
+ Hits        13584    35603    +22019     
+ Misses      27635     5619    -22016

Impacted Files	Coverage Δ
airflow/jobs/local_task_job.py	90.12% <100%> (+67.04%)	⬆️
airflow/kubernetes/volume_mount.py	44.44% <0%> (-55.56%)	⬇️
airflow/kubernetes/volume.py	52.94% <0%> (-47.06%)	⬇️
airflow/kubernetes/pod_launcher.py	47.18% <0%> (-39.44%)	⬇️
...viders/cncf/kubernetes/operators/kubernetes_pod.py	69.38% <0%> (-25.52%)	⬇️
airflow/kubernetes/refresh_config.py	50.98% <0%> (-23.53%)	⬇️
airflow/bin/airflow	84.61% <0%> (ø)	⬆️
airflow/plugins_manager.py	86.95% <0%> (+0.72%)	⬆️
airflow/bin/cli.py	94.73% <0%> (+2.1%)	⬆️
airflow/executors/celery_executor.py	88.51% <0%> (+3.37%)	⬆️
... and 749 more

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[boring-cyborg]

Awesome work, congrats on your first merged pull request!