feat: track resource replacements when claiming a prebuilt workspace (#17571)

Closes https://github.com/coder/internal/issues/369

We can't know whether a replacement (i.e. drift of terraform state
leading to a resource needing to be deleted/recreated) will take place
apriori; we can only detect it at `plan` time, because the provider
decides whether a resource must be replaced and it cannot be inferred
through static analysis of the template.

**This is likely to be the most common gotcha with using prebuilds,
since it requires a slight template modification to use prebuilds
effectively**, so let's head this off before it's an issue for
customers.

Drift details will now be logged in the workspace build logs:


![image](https://github.com/user-attachments/assets/da1988b6-2cbe-4a79-a3c5-ea29891f3d6f)

Plus a notification will be sent to template admins when this situation
arises:


![image](https://github.com/user-attachments/assets/39d555b1-a262-4a3e-b529-03b9f23bf66a)

A new metric - `coderd_prebuilt_workspaces_resource_replacements_total`
- will also increment each time a workspace encounters replacements.

We only track _that_ a resource replacement occurred, not how many. Just
one is enough to ruin a prebuild, but we can't know apriori which
replacement would cause this.
For example, say we have 2 replacements: a `docker_container` and a
`null_resource`; we don't know which one might
cause an issue (or indeed if either would), so we just track the
replacement.

---------

Signed-off-by: Danny Kopping <dannykopping@gmail.com>

coderd/notifications/notificationstest/fake_enqueuer.go

@@ -9,6 +9,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 
 	"github.com/coder/coder/v2/coderd/database/dbauthz"
+	"github.com/coder/coder/v2/coderd/notifications"
 	"github.com/coder/coder/v2/coderd/rbac"
 	"github.com/coder/coder/v2/coderd/rbac/policy"
 )
@@ -19,6 +20,12 @@ type FakeEnqueuer struct {
 	sent       []*FakeNotification
 }
 
+var _ notifications.Enqueuer = &FakeEnqueuer{}
+
+func NewFakeEnqueuer() *FakeEnqueuer {
+	return &FakeEnqueuer{}
+}
+
 type FakeNotification struct {
 	UserID, TemplateID uuid.UUID
 	Labels             map[string]string