feat: show warning in pr body

[MaronHatoum]

Changes

1. warnings has been added to PR body
2. display a relevant warnings msg (dependencyDashboard=true/false) in pr body

Context

closes #16924

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

[MaronHatoum]

Examples from real repository:

{
  "dependencyDashboard": true
}

MaronHatoum/warnings-in-PR-bodies#55

{
  "dependencyDashboard": false
}

MaronHatoum/warnings-in-PR-bodies#56

[Gabriel-Ladzaretti]

Nit

[HonkingGoose]

Some more fixes to the text.

[MaronHatoum]

I think we had a misunderstanding about the purpose of this issue. I have updated it in #16924 so that it is clearer. There should be no impact on the onboarding PR

is this the expected result?

onboarding PR: MaronHatoum/pr-warnings#2
dependencyDashboard=true: MaronHatoum/pr-warnings#6
dependencyDashboard=false: MaronHatoum/pr-warnings#5

[renovate-release]

🎉 This PR is included in version 32.195.0 🎉

The release is available on:

• GitHub release
• 32.195.0

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