ci: fix HTMLTest HTTP 429 issues

[mowies]

This PR

• removes the docs/tmp/.htmltest path from the github cache since it's not needed anymore because of the recent docs tooling changes
• changes the cache key so that it includes a hash of the refcache.json file which stores external URLs checks from HTMLTest. This should fix recent HTTP 429 issues when new external links were added to the docs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9095a00) 85.82% compared to head (c8412b9) 85.85%.
Report is 2 commits behind head on main.

❗ Current head c8412b9 differs from pull request most recent head 01b9410. Consider uploading reports for the commit 01b9410 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2938      +/-   ##
==========================================
+ Coverage   85.82%   85.85%   +0.02%     
==========================================
  Files         161      161              
  Lines       10252    10252              
==========================================
+ Hits         8799     8802       +3     
+ Misses       1170     1168       -2     
+ Partials      283      282       -1     

see 1 file with indirect coverage changes

Flag	Coverage Δ
certificate-operator	67.42% <ø> (ø)
component-tests	56.82% <ø> (+0.73%)	⬆️
lifecycle-operator	84.88% <ø> (ø)
metrics-operator	87.63% <ø> (ø)

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[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

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