45143: ui: Release notes signup r=dhartunian a=koorosh

Resolves: #43912
Depends on: #44744, #44821, #44856 

- [x] WIP. Current branch has two branches merged which haven't been approved/merged in master branch yet.

- [x] rebase branch to remove merge commits from branches other than master.

Add Release notes signup form to Cluster Overview page
right after page title.
Release Notes signup view is created in `src/views/dashboard`
directory because it will be the main page where we display
this view. And Cluster Overview page is a temporary place
while Dashboard view doesn't exist.

These changes integrate three main parts: ReleaseNotesForm,
AlertNotification component and custom analytics saga.



45426: coldata: minor tweak of flat bytes r=yuzefovich a=yuzefovich

This commit changes `maybeBackfillOffsets` to update `maxSetIndex`
accordingly (this might be a minor performance improvement). In a sense,
when we're backfilling offsets, we *are* setting indices to point to
empty `[]byte` slices. Also, the logic for `Set` method is slightly
refactored.

Release note: None

45455: clusterversion: significantly rework cluster version handling r=tbg a=irfansharif

We split off ClusterVersion out of pkg/settings/cluster into a dedicated
pkg/clusterversion. This is to pave the way for #39182 where we
introduce long running version migration infrastructure.

We then introduce clusterversion.Handle as a read only view to the
active cluster version and this binary's version details. We similarly
fold in the actual global cluster version setting into
pkg/clusterversion, and enforce all external usage to go through
clusterversion.Handle. We can also hide away external usage of the baked
in cluster.Binary{,MinimumSupported}Version constants. Instead we have
the implementation of clusterversion.Handle allow for tests to override
binary and minimum supported versions as needed.

Along the way we clean up Settings.Initialized, as it is not really
used. We document all the various "versions" in play ("binary version",
    "minimum supported version", "active version") and change usage of what
was previously "serverVersion" to simply be "binaryVersion", because
that's what it is. We also clean up the Settings constructors into
Test/Non-Test types that differ in cluster version setting
initialization behaviour.

---

For reviewers: It's probably easiest to start with what 
pkg/settings/cluster/cluster_settings.go looks like, then following into
pkg/clusterversion/cluster_version.go and then pkg/clusterversion/setting.go.

---

I still don't like the following detail about our pkg structure:

- pkg/settings/cluster depends on it's "parent" pkg, pkg/settings
- pkg/settings/cluster depends pkg/clusterversion, which in turn depends
on pkg/settings

Naively, pkg/settings/cluster should be a top level package, but I'm not
making that change in this PR. For now I've renamed the settings.go file
to cluster_settings.go.

Release note: None


45535: Revert "storage,libroach: update MVCCIncrementalIterator to look at every updated key" r=pbardea a=pbardea

Reverts #45163

To stop the errors we're seeing on #45524. Will investigate further once it's off master.

Co-authored-by: Andrii Vorobiov <and.vorobiov@gmail.com>
Co-authored-by: Yahor Yuzefovich <yahor@cockroachlabs.com>
Co-authored-by: irfan sharif <irfanmahmoudsharif@gmail.com>
Co-authored-by: Daniel Harrison <daniel.harrison@gmail.com>
Co-authored-by: Paul Bardea <pbardea@gmail.com>