Use software version and a commit hash in pex filename

[benjaoming]

Summary

Uses kalite --version for the filename

TODO

If not all TODOs are marked, this PR is considered WIP (work in progress)

• [x] Has documentation been written/updated?
• [x] Have you written release notes for the upcoming release?

Reviewer guidance

n/a

Issues addressed

https://github.com/learningequality/ka-lite/issues/5558

[codecov[bot]]

Codecov Report

Merging #5564 into develop will increase coverage by 19.84%. The diff coverage is n/a.

@@             Coverage Diff              @@
##           develop    #5564       +/-   ##
============================================
+ Coverage    46.31%   66.15%   +19.84%     
============================================
  Files          113      113               
  Lines         6512     6512               
============================================
+ Hits          3016     4308     +1292     
+ Misses        3496     2204     -1292

Impacted Files	Coverage Δ
kalite/shared/api_auth/auth.py	41.53% <0%> (+0.76%)	:arrow_up:
kalite/topic_tools/content_recommendation.py	84.52% <0%> (+0.79%)	:arrow_up:
kalite/distributed/middleware.py	57.77% <0%> (+2.22%)	:arrow_up:
kalite/coachreports/api_views.py	93.07% <0%> (+2.3%)	:arrow_up:
kalite/facility/api_resources.py	93.79% <0%> (+3.1%)	:arrow_up:
kalite/shared/decorators/auth.py	42.7% <0%> (+3.12%)	:arrow_up:
kalite/contentload/api_views.py	29.5% <0%> (+3.27%)	:arrow_up:
kalite/main/api_views.py	89.47% <0%> (+3.5%)	:arrow_up:
kalite/main/api_resources.py	85.45% <0%> (+7.27%)	:arrow_up:
kalite/facility/models.py	74.56% <0%> (+10.4%)	:arrow_up:
... and 35 more

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[benjaoming]

The .pex from Buildkite in this PR is now called ka-lite-static0.18.0dev0-aebcf43ecf082cccd1b1ec066c7ca2c91375bc5c.pex, I'm okay with that :)