ci: optimize e2e deploy test performance and resource usage (#83058)
### What?
Optimize CI workflow performance by moving e2e test project reset to a
weekly cron schedule and increasing deploy test parallelization.
### Why?
The current workflow runs project reset on every deploy test execution,
making parallel investigations by manual dispatch impossible.
Additionally, deploy tests were limited to 6 parallel groups, creating a
bottleneck.
### How?
- Created new weekly cron workflow (`test_e2e_project_reset_cron.yml`)
that runs every Sunday at 5AM UTC
- Removed inline project reset step from deploy test workflow
- Increased deploy test matrix from 6 to 8 parallel groups for faster
execution
- Added manual workflow dispatch option for emergency resets