ci(v2): parameterise v2 packages ci to minimise duplication

[galargh]

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

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This PR is a subset of #5301.

This PR extends the approach introduced in #5564 onto the v2 packages. This minimises the duplication and makes future updates that should affect all package builds easier.

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Latest commit: 180994f

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Name	Status	Preview	Comments	Updated (UTC)
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[alcuadrado]

A change to the lockfile should trigger everything here too

[galargh]

I added pnpm lockfile handling in 180994f