Display information about the changesets present

[Noviny]

With the release of @changesets/get-release-plan we can get richer information about the existence non-existence of changesets: I think it would be good to change how this action works to something like:

1. yarn in repo and call getReleasePlan() using { sinceMaster: true }
2. With the output - check the length of the changesets array to see if there are new changesets ('empty' changesets is a feature we know AK wants that we want this to work with).
3. If there are, format the data in releases in some way to display this information.

Open questions:

a) is this mad?
b) how do we format the info?

i) probably need to separate packages from dependents here
ii) a table maybe?
iii) Do we include any summary info or leave that for PR-inspection?

Major downside:
requires this doing a yarn install etc

[emmatown]

yarn in repo

I strongly dislike this and would like to avoid it if possible. Could we bundle get-release-plan? I assume we would have the problem of the action getting out of date but I feel like the versioning parts are stable enough that it won't really be a problem.

a) is this mad?

I like it as an idea

b) how do we format the info?

i) probably need to separate packages from dependents here

SGTM

ii) a table maybe?

My thoughts are that it should be in a table inside a <details> element because huge automatic GitHub comments are annoying.

iii) Do we include any summary info or leave that for PR-inspection?

IMO, don't include it.

[Noviny]

Could we bundle get-release-plan?

We can bundle getReleaseplan probably. Looking at the current script, it bundles node_modules, so we can just piggyback on that functionality but with getReleasePlan included.

Good thought around avoiding the yarn.

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My thoughts are that it should be in a table inside a

element because huge automatic GitHub comments are annoying.

IMO, don't include it.

Easy agree on these