fix: reduce cost of prebuild failure (#17697)

Relates to https://github.com/coder/coder/issues/17432

### Part 1:

Notes:
- `GetPresetsAtFailureLimit` SQL query is added, which is similar to
`GetPresetsBackoff`, they use same CTEs: `filtered_builds`,
`time_sorted_builds`, but they are still different.

- Query is executed on every loop iteration. We can consider marking
specific preset as permanently failed as an optimization to avoid
executing query on every loop iteration. But I decided don't do it for
now.

- By default `FailureHardLimit` is set to 3.

- `FailureHardLimit` is configurable. Setting it to zero - means that
hard limit is disabled.

### Part 2

Notes:
- `PrebuildFailureLimitReached` notification is added.
- Notification is sent to template admins.
- Notification is sent only the first time, when hard limit is reached.
But it will `log.Warn` on every loop iteration.
- I introduced this enum:
```sql
CREATE TYPE prebuild_status AS ENUM (
  'normal',           -- Prebuilds are working as expected; this is the default, healthy state.
  'hard_limited',     -- Prebuilds have failed repeatedly and hit the configured hard failure limit; won't be retried anymore.
  'validation_failed' -- Prebuilds failed due to a non-retryable validation error (e.g. template misconfiguration); won't be retried.
);
```
`validation_failed` not used in this PR, but I think it will be used in
next one, so I wanted to save us an extra migration.

- Notification looks like this:
<img width="472" alt="image"
src="https://github.com/user-attachments/assets/e10efea0-1790-4e7f-a65c-f94c40fced27"
/>

### Latest notification views:
<img width="463" alt="image"
src="https://github.com/user-attachments/assets/11310c58-68d1-4075-a497-f76d854633fe"
/>
<img width="725" alt="image"
src="https://github.com/user-attachments/assets/6bbfe21a-91ac-47c3-a9d1-21807bb0c53a"
/>

coderd/database/querier.go

@@ -241,6 +241,15 @@ type sqlcQuerier interface {
 	GetPresetByWorkspaceBuildID(ctx context.Context, workspaceBuildID uuid.UUID) (TemplateVersionPreset, error)
 	GetPresetParametersByPresetID(ctx context.Context, presetID uuid.UUID) ([]TemplateVersionPresetParameter, error)
 	GetPresetParametersByTemplateVersionID(ctx context.Context, templateVersionID uuid.UUID) ([]TemplateVersionPresetParameter, error)
+	// GetPresetsAtFailureLimit groups workspace builds by preset ID.
+	// Each preset is associated with exactly one template version ID.
+	// For each preset, the query checks the last hard_limit builds.
+	// If all of them failed, the preset is considered to have hit the hard failure limit.
+	// The query returns a list of preset IDs that have reached this failure threshold.
+	// Only active template versions with configured presets are considered.
+	// For each preset, check the last hard_limit builds.
+	// If all of them failed, the preset is considered to have hit the hard failure limit.
+	GetPresetsAtFailureLimit(ctx context.Context, hardLimit int64) ([]GetPresetsAtFailureLimitRow, error)
 	// GetPresetsBackoff groups workspace builds by preset ID.
 	// Each preset is associated with exactly one template version ID.
 	// For each group, the query checks up to N of the most recent jobs that occurred within the
@@ -568,6 +577,7 @@ type sqlcQuerier interface {
 	UpdateOAuth2ProviderAppSecretByID(ctx context.Context, arg UpdateOAuth2ProviderAppSecretByIDParams) (OAuth2ProviderAppSecret, error)
 	UpdateOrganization(ctx context.Context, arg UpdateOrganizationParams) (Organization, error)
 	UpdateOrganizationDeletedByID(ctx context.Context, arg UpdateOrganizationDeletedByIDParams) error
+	UpdatePresetPrebuildStatus(ctx context.Context, arg UpdatePresetPrebuildStatusParams) error
 	UpdateProvisionerDaemonLastSeenAt(ctx context.Context, arg UpdateProvisionerDaemonLastSeenAtParams) error
 	UpdateProvisionerJobByID(ctx context.Context, arg UpdateProvisionerJobByIDParams) error
 	UpdateProvisionerJobWithCancelByID(ctx context.Context, arg UpdateProvisionerJobWithCancelByIDParams) error