Fix default theme and plugin list inconsistency

[weiiwang01]

Overview

WordPress charm defines a _WORDPRESS_DEFAULT_THEMES and _WORDPRESS_DEFAULT_PLUGINS list containing all default installed themes and plugins in the workload image. These lists serve as the reference for theme and plugin management so it must alignment with themes and plugins within the OCI image.

Update the two list to resolve problems caused by the inconsistency.

Reference for obtaining the lists of default themes and plugins:

# build the WordPress image
rockcraft pack
skopeo --insecure-policy copy oci-archive:$(ls *.rock) docker-daemon:wordpress-image:latest

# start a mysql database for WordPress
docker run -d -e MYSQL_USER=wordpress -e MYSQL_PASSWORD=wordpress -e MYSQL_DATABASE=wordpress -e MYSQL_ROOT_PASSWORD=wordpress --name=mysql mysql:latest

# install WordPress and print all themes and plugins
docker run -it --rm --entrypoint /bin/bash --workdir /var/www/html wordpress-image:latest
wp config create --dbname=wordpress --dbuser=wordpress --dbpass=wordpress --dbhost=<mysql-ip>
wp core install --url=example.com --title=test --admin_user=admin --admin_email=admin@example.com
wp theme list
wp plugin list

# clean up
docker rm -f mysql

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, complex)

[github-actions]

Test coverage for cedf252

Name                Stmts   Miss Branch BrPart  Cover   Missing
---------------------------------------------------------------
src/charm.py          530     41    172     31    89%   190-193, 357-358, 558, 589, 595, 640, 675-676, 727-734, 739, 841->846, 845, 847, 852-853, 913, 931, 938, 1028, 1037, 1049, 1070, 1079, 1098, 1102, 1131, 1184, 1316, 1338, 1345->1347, 1390->exit, 1402, 1418, 1455, 1464-1465
src/cos.py             15      0      0      0   100%
src/exceptions.py      17      1      2      1    89%   41
src/types_.py          16      0      0      0   100%
---------------------------------------------------------------
TOTAL                 578     42    174     32    90%

Static code analysis report

Run started:2023-11-24 06:02:49.519725

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 4278
  Total lines skipped (#nosec): 1
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):

[Thanhphan1147]

LGTM, thanks!