BugFix: Show task_id in the Graph View tooltip

[kaxil]

I am not sure how to add a test for this as the Tooltip is generated using jQuery

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[codecov-io]

Codecov Report

Merging #7859 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7859      +/-   ##
==========================================
- Coverage   86.97%   86.96%   -0.01%     
==========================================
  Files         927      927              
  Lines       44963    44963              
==========================================
- Hits        39108    39104       -4     
- Misses       5855     5859       +4     

Impacted Files	Coverage Δ
airflow/providers/postgres/hooks/postgres.py	93.05% <0.00%> (-1.39%)	⬇️
airflow/jobs/scheduler_job.py	90.44% <0.00%> (-0.44%)	⬇️

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