Add new inputs to e2e action to allow config override.

[Hug0-Drelon]

What?

• Create wp-env-config-path to optionally pass a specific wp-env config file.
• Create playwright-cmd to optionally pass a specific Playwright command (useful for non usual config)
• Take the opportunity to improve the cache system for node_modules, Playwright binaires and wp-env docker images.

[Hug0-Drelon]

Closing in favor of a split:

1. Inputs: will link after create
2. Cache: will link after create

[Hug0-Drelon]

Split into:

1. Inputs — feat(e2e): add wp-env-config-path and playwright-cmd inputs #19
2. Cache — perf(e2e): improve node_modules, Playwright and wp-env home caching #20