Highlight submission selection buttons

[JasirZaeem]

Closes #937

Currently the buttons to select a specific iteration of a submission are the same color, except the one currently selected.
e.g.

In this PR,

• the appearance of the buttons have been changed to be outlined.
• The buttons are coloured according to the status of their respective submission.
• The selected button has the active class and is filled.

[vercel]

@JasirZaeem is attempting to deploy a commit to a Personal Account owned by @garageScript on Vercel.

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[codecov]

Codecov Report

Merging #1036 (8635af5) into master (86ab199) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1036   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          123       123           
  Lines         1996      1998    +2     
  Branches       485       485           
=========================================
+ Hits          1996      1998    +2     

Impacted Files	Coverage Δ
components/SelectIteration.tsx	100.00% <100.00%> (ø)

[vercel]

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[ggwadera]

Cool!