Added installing julia and removed the restore keys

[calvinp0]

• Install julia during the cache update so that is is also cached, thus reducing CI time
• Since we are using update-cache as control for updating the caches, we shouldn't be restoring previous caches

[codecov-commenter]

Codecov Report

Merging #118 (ed08ca3) into main (2de3b76) will decrease coverage by 0.07%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
- Coverage   73.46%   73.40%   -0.07%     
==========================================
  Files          22       22              
  Lines        2891     2891              
  Branches      762      762              
==========================================
- Hits         2124     2122       -2     
- Misses        552      553       +1     
- Partials      215      216       +1     

Flag	Coverage Δ
unittests	73.40% <ø> (?)

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Impacted Files	Coverage Δ
t3/settings/t3_submit.py	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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[calvinp0]

They were removed because I figured when update cache runs, it shouldn't be skipping steps hey restoring a previous cache. We want it to ensure it's always up to date with the latest repos. Therefore it will run everything in its entirety and then save it to the cache for us to use later