Teach Dependabot how to present multi-directory PRs

[Nishnha]

Fix up the title and PR body for mutli-directory PRs so they split the dependency updates by directory.

So a mutli-dependency PR would look like

[Nishnha]

This is what it looks like in practice

(/foo and /bar have the same dependencies in this example)

Not exactly what I was going for though - I wanted it to be:

"Bumps the go_modules group across 2 directories with 2 updates"

Updates github.com/consensys/gnark-crypto from 0.9.1 to 0.12.1
Updates golang.org/x/text from 0.0.0-20170915032832-14c0d48ead0c to 0.3.8

"Bumps the go_modules group across 2 directories with 2 updates"

Updates github.com/consensys/gnark-crypto from 0.9.1 to 0.12.1
Updates golang.org/x/text from 0.0.0-20170915032832-14c0d48ead0c to 0.3.8

But now I realize that if the PR body gets truncated, the summaries will be missing, so maybe it's okay that they're all at the top of the PR body?

I'm going to merge this PR and if we want to change it later we can. We still have to fix the branch name too.

[carogalvin]

The summary is duplicated at the top, will that happen every time?

[Nishnha]

The summary is duplicated at the top, will that happen every time?

No it will change depending on the dependencies updated for that directory. I'm going to make a minor change so that the directory is included in the summary, and then I'll share a better example with different dependencies.