feat(self-hosted): convert experimental env vars to config options

[RahulGautamSingh]

Changes

• Converted the following experimental env vars to self-hosted config options

Env var	Config option
RENOVATE_X_DELETE_CONFIG_FILE	deleteConfigFile
RENOVATE_X_S3_ENDPOINT	s3Endpoint
RENOVATE_X_S3_PATH_STYLE	s3PathStyle

There are some boolean types here. They could not be converted to experimentalFlags because GlobalConfig hasn't been initialized yet, when they are used, hence converting them to self-hosted config options instead.

Context

Last of: #27879 (comment)

Documentation (please check one with an [x])

• I have updated the documentation, or
• 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
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository (locally)

[RahulGautamSingh]

Verified each migration locally, by either logging the values of each option at runtime or confirming that they are working as expected
check 1: default values passed to functions ☑️
check 2: custom values (from cli, env, file), overwrites default values ☑️
check 3: old env vars parsed and then overwrite the default values ☑️

[HonkingGoose]

Some small things, then good to go.

[HonkingGoose]

Good to go for me. But the maintainers should do the final review. 😉

[RahulGautamSingh]

It's been a while since I have tested these, so I will test once and open afterwards.

Updated: Test complete 🙌

[rarkins]

Needs conflict resolution

[rarkins]

@nabeelsaabna please review

[nabeelsaabna]

We are only using RENOVATE_X_DELETE_CONFIG_FILE

[renovate-release]

🎉 This issue has been resolved in version 38.21.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 38.21.0

Your semantic-release bot 📦🚀