fix(manager/npm): invalid link in git hash updates for npm

[olegkrivtsov]

Changes:

Work in progress. I'd like to push my current changes to request some feedback/advice.

I'm currently in doubt. I've modified prBodyDefinitions and the link is now overridden when the updateType is digest. But, it is not clear:

1. For some strange reason the platform variable which is consumed by Handlebars equals to togithub. It is weird, not sure why it looks like this. In my test, my link points to https://togithub.com/olegkrivtsov/renovate-npm-bug/compare/9e3dc07...489cbc7, so the domain name is incorrect. What variable should I use to get the correct platform name?
2. Does the link make sense only for GitHub.com. What happens if a repo belongs to a different platform?
3. I tested on a real repository https://github.com/olegkrivtsov/renovate-npm-bug. Should I somehow provide a unit test for this?

Context:

Closes: #6224

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

[rarkins]

togithub.com is used to avoid backlink spam - it's intentional

[rarkins]

But using platform is not correct. e.g. won't be correct for bitbucket.com, etc. I think best if you just remove the incorrect link in this PR and then add a new issue for creating source URL compare links in a new issue (which needs discussion first).

[olegkrivtsov]

Hi @rarkins I removed the link for digest update type, so now it just shows oldDigest -> newDigest in the Changes column. Please review another time.

[rarkins]

@olegkrivtsov can you test it on a real repo, showing both digest and non-digest updates?

[olegkrivtsov]

@rarkins I've done that on https://github.com/olegkrivtsov/renovate-npm-bug. You can see that Renovate created two PRs - one for digest, and one for non-digest.

[renovate-release]

🎉 This PR is included in version 28.0.2 🎉

The release is available on:

• GitHub release
• 28.0.2

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