refactor(cache): use `rm.content` to remove expired content

[RahulGautamSingh]

Changes

• Use the combination of rm.content and rm.entry to remove the content from the disk and the entry from the index
• Remove cacache.verify as it took longer than desriable to confirm that content is removed

  we give up the guarantee that we clear any and all unwanted entries from the index/disk but we do delete the expired content from the disk with certainity, which was the original intention I believe

Context

Closes: https://github.com/renovatebot/renovate/issues/29795

Documentation (please check one with an [x])

• [ ] I have updated the documentation, or
• [x] No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• [ ] Code inspection only, or
• [ ] Newly added/modified unit tests, or
• [x] No unit tests but ran on a real repository, or
• [ ] Both unit tests + ran on a real repository

[rarkins]

I tested this locally and got:

DEBUG: Checking file package cache for expired items
DEBUG: Deleted 113 of 192 file cached entries in 302ms

I don't have a "before" to compare it to

[renovate-release]

:tada: This PR is included in version 37.418.3 :tada:

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 37.418.3

Your semantic-release bot :package::rocket: