portfolio: refactor caching - and add cron to write cache

[protitude]

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[Copilot]

Pull request overview

This PR refactors the Project Portfolio Google Sheet integration by introducing a shared caching service and adding an Ultimate Cron job to warm that cache, so sheet fetches happen off the request-render path while still allowing a cold-miss fallback.

Changes:

• Add PortfolioData service to centralize fetch + cache write/refresh behavior (including tag invalidation on refresh).
• Update PortfolioBlock to use the new service and emit cache metadata (tag + max-age) for downstream caches.
• Add an Ultimate Cron job and callback to refresh the cache on a schedule, plus unit tests for the new service.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/Services/PortfolioData.php	New service providing shared fetch/cache + refresh/tag invalidation.
src/Plugin/Block/PortfolioBlock.php	Switches block to DI + uses oit.portfolio service; adds cache tag/max-age.
src/Services/CronManager.php	Adds cron callback to refresh portfolio cache (live env only).
oit.services.yml	Registers oit.portfolio service with cache + tag invalidator dependencies.
config/install/ultimate_cron.job.portfolio_refresh.yml	Adds scheduled Ultimate Cron job to warm the portfolio cache.
tests/src/Unit/Services/PortfolioDataTest.php	Adds unit tests covering cache-hit/miss and refresh behavior.

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