Simplify publication tag handling

[caendesilva]

Simplifies how publication tags are handled.

Notably:

• The tagGroup property is now removed. It's assumed the tag group is the same as the publication type's identifier (same as the publication's directory name)
• Removes the $reload parameter and the caching of tags

[codecov]

Codecov Report

Merging #770 (9709c3c) into publications-feature (031bfc4) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 9709c3c differs from pull request most recent head d552077. Consider uploading reports for the commit d552077 to get more accurate results

@@                    Coverage Diff                     @@
##             publications-feature     #770      +/-   ##
==========================================================
- Coverage                   98.52%   98.52%   -0.01%     
+ Complexity                   2784     1390    -1394     
==========================================================
  Files                         324      162     -162     
  Lines                        7722     3855    -3867     
==========================================================
- Hits                         7608     3798    -3810     
+ Misses                        114       57      -57     

Impacted Files	Coverage Δ
...rk/src/Console/Commands/MakePublicationCommand.php	69.62% <0.00%> (ø)
...ework/Features/Publications/PublicationService.php	100.00% <0.00%> (ø)
.../Features/Publications/Models/PublicationField.php	100.00% <0.00%> (ø)
...rk/src/Console/Commands/MakePublicationCommand.php
...c/Console/Commands/ValidatePublicationsCommand.php
...rk/src/Framework/Actions/SeedsPublicationFiles.php
.../Features/Publications/Models/PublicationField.php
...ework/Features/Publications/PublicationService.php
...ework/src/Framework/Actions/MarkdownFileParser.php
packages/framework/src/Facades/Includes.php
... and 155 more

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