fix(core/config): Log cached repo config filename and content

[Gabriel-Ladzaretti]

Changes

logs cached config when available via repositoryCache = 'enabled'

Context

Closes #16122

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 tick 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

[Gabriel-Ladzaretti]

Live run

DEBUG: Checking cached config file name (repository=ladzaretti/stability-days-demo)
DEBUG: Existing config file confirmed (repository=ladzaretti/stability-days-demo)
DEBUG: Repository config (repository=ladzaretti/stability-days-demo)
       "fileName": "renovate.json",
       "config": {
         "stabilityDays": 10,
         "ignoreTests": false,
         "packageRules": [
           {
             "schedule": ["before 3pm"],
             "automergeSchedule": ["before 3pm"],
             "matchUpdateTypes": ["minor", "patch"],
             "automerge": true
           }
         ],
         "automergeType": "pr"
       }
DEBUG: Repo is onboarded (repository=ladzaretti/stability-days-demo)

[renovate-release]

🎉 This PR is included in version 32.89.3 🎉

The release is available on:

• GitHub release
• 32.89.3

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