Bug 1863187 - Add "how to run locally" information into Artifacts and Debugging Tools tab.

[arai-a]

for https://bugzilla.mozilla.org/show_bug.cgi?id=1863187

(this replaces #7868 for the "how to run locally" part.
#7868 could still be used with some rework, to show the single-line description field in the TreeHerder UI.)

Added one feature and one minor tweak:

• Add "How to run locally" section to "Artifacts and Debugging Tools" tab
  • This shows the content of extra.local-run field of the job YAML file
  • The field can contain the commands, explanation, and links to document
• Add "Artifacts" header above artifacts list

This modifies the database in the following way:

• Add local_run column to job_type table
  • this column defaults to empty string

the job's extra.local-run field is retrieved from the task cluster's task query's result.

Here's screenshot with this patch

the data is ingested from https://treeherder.mozilla.org/jobs?repo=try&revision=efa598d1c2de420094d36619ed03af1cbbff7939

[arai-a]

possible followup:

• maybe we could format the content with markdown, instead of using <pre> (if introducing markdown parser there isn't too much troublesome)

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (cf69e68) 76.83% compared to head (37b06a6) 76.85%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7869      +/-   ##
==========================================
+ Coverage   76.83%   76.85%   +0.01%     
==========================================
  Files         538      539       +1     
  Lines       26621    26641      +20     
  Branches     3360     3365       +5     
==========================================
+ Hits        20455    20475      +20     
  Misses       6001     6001              
  Partials      165      165              

Files	Coverage Δ
tests/webapp/api/test_jobs_api.py	100.00% <ø> (ø)
treeherder/etl/job_loader.py	87.02% <ø> (ø)
treeherder/etl/jobs.py	95.06% <100.00%> (+0.29%)	⬆️
treeherder/etl/taskcluster_pulse/handler.py	57.61% <100.00%> (+0.20%)	⬆️
...eherder/model/migrations/0031_jobtype_local_run.py	100.00% <100.00%> (ø)
treeherder/model/models.py	82.30% <100.00%> (+0.02%)	⬆️
treeherder/webapp/api/jobs.py	82.22% <ø> (ø)
treeherder/webapp/api/serializers.py	88.15% <ø> (ø)
ui/shared/JobArtifacts.jsx	92.30% <82.35%> (+1.13%)	⬆️

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