Move some compile time vars to runtime

[vbaranov]

Resolves #6310

Motivation

NETWORK_PATH env variable is compile-time variable.

Changelog

NETWORK_PATH can be changed in runtime now.

Chore:

• removing of SOCKET_ROOT, API_PATH env variables (both are managed through NETWORK_PATH now)
• DISABLE_BRIDGE_MARKET_CAP_UPDATER, CACHE_BRIDGE_MARKET_CAP_UPDATE_INTERVAL are removed from CI as not used in the application.
  Docs update in NETWORK_PATH in runtime docs#121

Checklist for your Pull Request (PR)

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools