fix(manager:helmfile): remove go templating strings on a best effort basis for yaml parsing (#15106)


Signed-off-by: Jack Andersen <jandersen@plaid.com>
Co-authored-by: Rhys Arkins <rhys@arkins.net>
Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

* refactor: strict null checks for util

* chore: fix type

* Update tsconfig.strict.json

* Update lib/util/package-rules.ts

* Update lib/util/package-rules.ts

* chore: fix test and coverage

* chore: fix package rules

* refactor(manager): strict null checks

* chore: revert config changes

Moves datasource, manager, platform and versioning code from lib/ into new lib/modules/

BREAKING CHANGE: External tools must update paths to datasource, manager, platform and versioning

* refactor: Use union type for SkipReason

* Fix snapshot

* Fix snapshot

Co-authored-by: Rhys Arkins <rhys@arkins.net>

Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Rhys Arkins <rhys@arkins.net>

* chore(deps): update dependency prettier to v2

* Run prettier-fix

Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Jamie Magee <jamie.magee@gmail.com>