Add dependabot and auto hack scripts

[nak3]

As per title, this patch adds dependabot.

/cc @kvmware @dprotaso

[knative-prow]

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (f25e82a) 82.84% compared to head (4a5cc23) 82.84%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #830   +/-   ##
=======================================
  Coverage   82.84%   82.84%           
=======================================
  Files          45       45           
  Lines        1708     1708           
=======================================
  Hits         1415     1415           
  Misses        252      252           
  Partials       41       41           

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[nak3]

/hold

[krsna-m]

This should be added to either actions or .github repo so that we can just sync the file across repos. Not everyone uses dependabot but there are a few that do and would benefit from it.

[nak3]

Okay, I was hesitated to adding the common dependabot because some repo has their own dependabot like https://github.com/knative-extensions/eventing-kafka-broker/blob/main/.github/workflows/build-dependabot-pr.yaml
But I will add it to the common one.

[krsna-m]

We already merged this dependabot workflow and it is my bad for not mentioning this then. However, we should generalize this and move it to actions or .github so others can take advantage.