Backport of docs: update depends_on.mdx meta-argument into v1.2

Backport of deprecate unmaintained remote state backends into v1.2

Merge pull request #31209 from hashicorp/backport/add-format-function-guidance/ultimately-lucky-halibut

Backport of Add guidance about using the format function into v1.2

Backport of Add details reg. verbosity of debug log level (replace #29641) into v1.2

Merge pull request #31190 from hashicorp/backport/bflad-GetProviderSchema-early-diag-return/duly-intimate-guinea

Backport of Return early on GetProviderSchema RPC responses with error diagnostics into v1.2

Backport of Fix custom conditions example into v1.2

Co-authored-by: uturunku1 <luces.huayhuaca@gmail.com>

Co-authored-by: Katy Moe <katy@katy.moe>

* backport of commit 42a12a47



* backport of commit cae313385613a883cf6583ac0bf31be327739ff9
Co-authored-by: Katy Moe <katy@katy.moe>

Merge pull request #31151 from hashicorp/backport/alisdair/var-flag-spaces-error/repeatedly-promoted-lionfish

Backport of cli: Improved error for invalid -var "foo = bar" into v1.2

Merge pull request #31152 from hashicorp/backport/29156_do_not_log_sensitive_values/nearly-safe-bullfrog

Backport of Fixes #29156: Failing sensitive variables values are not logged into v1.2

Co-authored-by: Nick Fagerlund <nick.fagerlund@gmail.com>

Backport of update go-getter into v1.2

Backport of add unknown paths to diags for debugging into v1.2

Previously we'd discard everything after the second dash.

This also sets an additional variable if it detects that this is an alpha
or development build, which currently does nothing but might eventually
turn on the ability to use experimental features, if we make that
something available only in prereleases.

The actions/checkout workflow does some heroics to try to fetch exactly
the commit being built and nothing else, even if asked to fetch the
history leading up to that commit. That means we don't end up having
enough information to get an accurate answer from "git describe".

Since we're intentionally relying on the git history here, we'll fetch
all of the tags explicitly after initial checkout. Although that does add
some delay to this step, we're intentionally doing this version
calculation only once as a separate workflow job so that all of the other
jobs can still benefit from this action's quicker checkout behavior.

Backport of Add version notes 1.2 into v1.2

Merge pull request #31112 from hashicorp/backport/alisdair/fix-configload-snapshot-panic/forcibly-hopeful-pony

Backport of configs: Fix module loader nil pointer panic into v1.2