While working on VAULT-34829 it became apparent that if our new backporter
could know which branches are active and which CE counterparts are active
then we could completely omit the need for `ce` backport labels and instead
automatically backport to corresponding CE branches that are active.
To facilitate that we can re-use our `.release/versions.hcl` file as it is
the current source of truth for our present backport assistant workflow.
Here we add a new `pipeline releases list versions` command that is capable
of decoding that file and optionally displaying it. It will be used in the
next PR that fully implements VAULT-34829.
As part of this work we refactors `pipeline releases` to include a new `list`
sub-command and moved both `list-active-versions` and `versions` to it.
We also include a few small fixes that were noticed:
- `.release/verions.hcl` was not up-to-date
- Our cached dynamic config was not getting recreated when the pipeline
tool changed. That has been fixed so now dynamic config should always
get recreated when the pipeline binary changes
- We now initialize a git client when using the `github` sub-command.
This will be used in more forthcoming work
- Update our changed file detection to resolve some incorrect groupings
- Add some additional changed file helpers that we be used in forthcoming
work
Signed-off-by: Ryan Cragun <me@ryan.ec>
