SITES-19937: remove caching in LanguageNavigationSiteRootSelectionStrategy.java

[buuhuu]

Q	A
Fixed Issues?	SITES-19937
Patch: Bug Fix?	👍
Minor: New Feature?
Major: Breaking Change?
Tests Added + Pass?	Yes
Documentation Provided	Yes (code comments and or markdown)
Any Dependency Changes?
License	Apache License, Version 2.0

The weak hash map cache causes a flaky behaviour eventually leading to accessing a repository object which's session has already been closed.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (58c0496) 87.28% compared to head (257d121) 87.28%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2678 +/- ## ========================================= Coverage 87.28% 87.28% + Complexity 2661 2659 -2 ========================================= Files 232 232 Lines 7117 7110 -7 Branches 1086 1084 -2 ========================================= - Hits 6212 6206 -6 Misses 359 359 + Partials 546 545 -1 ```

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