feat!: extract provisioner tags from coder_workspace_tags data source (#15578)

Relates to https://github.com/coder/coder/issues/15087 and
https://github.com/coder/coder/issues/15427

- Extracts provisioner job tags from `coder_workspace_tags` on template
version creation using `provisioner/terraform/tfparse` added in
https://github.com/coder/coder/pull/15236
- Drops a WARN log in coderd if no matching provisioners found.
- Also drops a warning message in the CLI if no provisioners are found.
- To support both CLI and UI warnings, added a
`codersdk.MatchedProvisioners` struct to the `TemplateVersion` response
containing details of how many provisioners were around at the time of
the insert.

Co-authored-by: Mathias Fredriksson <mafredri@gmail.com>

cli/templatepush.go

@@ -2,6 +2,7 @@ package cli
 
 import (
 	"bufio"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -415,6 +416,29 @@ func createValidTemplateVersion(inv *serpent.Invocation, args createValidTemplat
 	if err != nil {
 		return nil, err
 	}
+	var tagsJSON strings.Builder
+	if err := json.NewEncoder(&tagsJSON).Encode(version.Job.Tags); err != nil {
+		// Fall back to the less-pretty string representation.
+		tagsJSON.Reset()
+		_, _ = tagsJSON.WriteString(fmt.Sprintf("%v", version.Job.Tags))
+	}
+	if version.MatchedProvisioners.Count == 0 {
+		cliui.Warnf(inv.Stderr, `No provisioners are available to handle the job!
+Please contact your deployment administrator for assistance.
+Details:
+	Provisioner job ID : %s
+	Requested tags     : %s
+`, version.Job.ID, tagsJSON.String())
+	} else if version.MatchedProvisioners.Available == 0 {
+		cliui.Warnf(inv.Stderr, `All available provisioner daemons have been silent for a while.
+Your build will proceed once they become available.
+If this persists, please contact your deployment administrator for assistance.
+Details:
+	Provisioner job ID : %s
+	Requested tags     : %s
+	Most recently seen : %s
+`, version.Job.ID, strings.TrimSpace(tagsJSON.String()), version.MatchedProvisioners.MostRecentlySeen.Time)
+	}
 
 	err = cliui.ProvisionerJob(inv.Context(), inv.Stdout, cliui.ProvisionerJobOptions{
 		Fetch: func() (codersdk.ProvisionerJob, error) {