[26.1] Fix tool panel discover counts and recent tool version duplicates

[itisAliRH]

Fixes incorrect tool counts in the tool panel, discovers CTA, and duplicate-looking entries in My Tools recent tools.

The discover CTA was counting all installed tool entries from /api/tools?in_panel=false, which includes older tool versions. On UseGalaxy.eu, which produced Discover 16k+ Tools, while the displayed default panel contains about 4.2k unique tools.

This changes the count to use unique displayed tool IDs from panel data instead. It also fixes the My Tools view, where the header needs to count the default discoverable panel instead of the active my_panel data.

Recent tools now canonicalize stored Tool Shed version IDs to the version currently displayed in the panel, so a tool with multiple installed versions appears once, using the displayed/latest panel entry.

How to test the changes?

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. Start the client dev server against a Galaxy instance with multiple installed versions of the same Tool Shed tool.
  2. Open the tool panel default view and confirm the discover CTA shows the unique displayed panel count, e.g. Discover 4k+ Tools, not the full installed-version count.
  3. Switch to My Tools and confirm the discover CTA uses the same default panel count.
  4. Run a tool where multiple versions are installed and confirm Recent tools shows one entry for the displayed panel version.

Manual/API sanity check performed locally against usegalaxy.eu:

• /api/tools?in_panel=false: 16613 entries
• /api/tool_panels/default: 4290 unique displayed tool IDs
• expected CTA: Discover 4k+ Tools

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.