Use the right base URL for the ESS config/well known endpoints

[jmartinesp]

Content

• Rename UrlContentFetcher to ClientUrlContentFetcher and add a couple server and homeserverUrl properties to it, so anything using the fetcher can use any of those as base URLs. This is needed for a Pro feature.
• When we try to load a remote config from an endpoint and we don't find a valid value, store it as NotFound(needsRefresh = false) so we know we've already checked and there was nothing there. This should still trigger a request to fetch the value, but on background, not blocking. This was causing the session restoration to be slower than needed, since ContentScannerUrlProvider was trying to fetch the remote config.

FOSS part of https://github.com/element-hq/element-android-enterprise/pull/45

Motivation and context

• Fix an issue where the incorrect ESS config URL was being created.
• Fix the delay when restoring a client.

Tests

With Element Pro, check the right ESS config endpoint and alternatively the right well-known endpoints are checked.

Tested devices

• Physical
• Emulator
• OS version(s): 15

Checklist

• I am aware of the etiquette.
• This PR was made with the help of AI:
  • Yes. In this case, please request a review by Copilot.
  • No.
• Changes have been tested on an Android device or Android emulator with API 24
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly defines what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• You've made a self review of your PR

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[codecov]

Codecov Report

❌ Patch coverage is 63.63636% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.64%. Comparing base (8b2c207) to head (dfaae02).
⚠️ Report is 21 commits behind head on develop.

Files with missing lines	Patch %	Lines
...e/api/remoteconfig/RemoteEnterpriseConfigResult.kt	33.33%	2 Missing ⚠️
...atures/enterprise/impl/DefaultEnterpriseService.kt	0.00%	2 Missing ⚠️
.../features/enterprise/test/FakeEnterpriseService.kt	60.00%	2 Missing ⚠️
...braries/matrix/test/FakeClientUrlContentFetcher.kt	75.00%	1 Missing ⚠️
...es/matrix/test/FakeTemporaryMatrixClientFactory.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #7469   +/-   ##
========================================
  Coverage    80.64%   80.64%           
========================================
  Files         2758     2759    +1     
  Lines        80588    80594    +6     
  Branches     11029    11028    -1     
========================================
+ Hits         64989    64998    +9     
+ Misses       11342    11340    -2     
+ Partials      4257     4256    -1     

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[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud