Convert and deprecate helper functions related to deprecated drupal_static() calls

Problem/Motivation

Drupal 11.5 deprecates drupal_static() and drupal_static_reset() (removed in 13.0.0, see the change record). Token still keeps three caches in drupal_static(), so every project that tests against Drupal 12 with Token installed gets these deprecations:

• token_menu_link_load_all_parents(), token.module line 279
• token_taxonomy_term_load_all_parents(), token.module line 339
• token_book_load_all_parents(), token.module line 408

Two more calls reset them: token_clear_cache() (token.module lines 105-106) and TokenEntityHooks::menuLinkContentPresave() (line 101).

The messages look like this:

Calling drupal_static() with "token_menu_link_load_all_parents" as argument is deprecated in drupal:11.5.0 and is removed from drupal:13.0.0. Use \Drupal::cache('memory')->set() and \Drupal::cache('memory')->get() instead.

A dependent module cannot work around this. In 11.5, drupal_static() still keeps its values in a PHP static array, so \Drupal::cache('memory')->delete() does not clear Token's caches. A module that needs to reset one of them in a test has no choice but to call the deprecated drupal_static_reset() itself.

Two problems in the same code, found while reading it:

• token_clear_cache() resets 'token_book_link_load', but no function has that name. The book cache belongs to token_book_load_all_parents(), so that reset clears nothing.
• Nothing ever resets token_taxonomy_term_load_all_parents(). Menu links get a reset on presave, but terms do not. If a parent term is renamed in a request that has already read its children's parent names, [term:parents] still returns the old name for the rest of that request.

Proposed resolution

Move the three caches to the memory cache bin: get()/set() in the loaders, delete() in the resets. Use each function's name as the cache ID, so the existing names keep their meaning.

Token supports ^10.3 || ^11 || ^12, and the cache.memory service does not exist on Drupal 10 (it is not in 10.6's core.services.yml). So keep drupal_static() below 11.5 and use the memory cache from 11.5 on, for example with DeprecationHelper::backwardsCompatibleCall() in one small helper per operation, rather than repeating the version check at each call site.

While there:

• Make token_clear_cache() reset the book cache under its real name.
• Reset the term parents cache when a taxonomy term is saved, the same way menu link content is handled.

Remaining tasks

• Write the patch or MR.
• Add a test that a term rename is reflected in [term:parents] within the same request.

Found while raising Domain Path to PHPStan level 5 (#3620533), whose Drupal 12 lane now ignores these deprecations until Token is fixed.

AI-Generated: Yes (Claude Code was used to help draft this issue summary and to write the code and test on the merge request. I reviewed and ran the work myself before posting it.)