chore: remove coder_secret Terraform integration (#25512)

Removes the coder_secret Terraform integration: the data.coder_secret
consumption path through provisionerdserver → provisioner.proto →
provisioner/terraform, the dynamic-parameter secret-requirement
validation, and the workspace-update / resolve-autostart surfaces that
depended on it. This is being done due to a product/feature direction
change (see PLAT-243). User-secret CRUD (DB, REST, CLI, UI, telemetry, audit)
and the agent-manifest secret-injection path are untouched.

The provisionerd API is bumped from v1.17 to v1.18 rather than rolled
back: v1.17 shipped in v2.33.x, so user_secrets field numbers are
reserved and the changelog documents both versions.

Generated with assistance from Coder Agents.

coderd/apidoc/docs.go

@@ -18895,7 +18895,7 @@ const docTemplate = `{
             "type": "object",
             "properties": {
                 "id": {
-                    "description": "ID identifies the request for response ordering. Websocket response\nIDs are monotonically increasing and may exceed the request ID when\nserver-side events trigger additional renders.",
+                    "description": "ID identifies the request. The response contains the same\nID so that the client can match it to the request.",
                     "type": "integer"
                 },
                 "inputs": {
@@ -18928,12 +18928,6 @@ const docTemplate = `{
                     "items": {
                         "$ref": "#/definitions/codersdk.PreviewParameter"
                     }
-                },
-                "secret_requirements": {
-                    "type": "array",
-                    "items": {
-                        "$ref": "#/definitions/codersdk.SecretRequirementStatus"
-                    }
                 }
             }
         },
@@ -22554,10 +22548,6 @@ const docTemplate = `{
             "properties": {
                 "parameter_mismatch": {
                     "type": "boolean"
-                },
-                "secret_mismatch": {
-                    "description": "SecretMismatch is true when the active template version declares\n` + "`" + `coder_secret` + "`" + ` requirements that the workspace owner's secrets do not\nsatisfy.",
-                    "type": "boolean"
                 }
             }
         },
@@ -22778,23 +22768,6 @@ const docTemplate = `{
                 }
             }
         },
-        "codersdk.SecretRequirementStatus": {
-            "type": "object",
-            "properties": {
-                "env": {
-                    "type": "string"
-                },
-                "file": {
-                    "type": "string"
-                },
-                "help_message": {
-                    "type": "string"
-                },
-                "satisfied": {
-                    "type": "boolean"
-                }
-            }
-        },
         "codersdk.ServerSentEvent": {
             "type": "object",
             "properties": {

coderd/apidoc/swagger.json

@@ -17163,7 +17163,7 @@
 			"type": "object",
 			"properties": {
 				"id": {
-					"description": "ID identifies the request for response ordering. Websocket response\nIDs are monotonically increasing and may exceed the request ID when\nserver-side events trigger additional renders.",
+					"description": "ID identifies the request. The response contains the same\nID so that the client can match it to the request.",
 					"type": "integer"
 				},
 				"inputs": {
@@ -17196,12 +17196,6 @@
 					"items": {
 						"$ref": "#/definitions/codersdk.PreviewParameter"
 					}
-				},
-				"secret_requirements": {
-					"type": "array",
-					"items": {
-						"$ref": "#/definitions/codersdk.SecretRequirementStatus"
-					}
 				}
 			}
 		},
@@ -20687,10 +20681,6 @@
 			"properties": {
 				"parameter_mismatch": {
 					"type": "boolean"
-				},
-				"secret_mismatch": {
-					"description": "SecretMismatch is true when the active template version declares\n`coder_secret` requirements that the workspace owner's secrets do not\nsatisfy.",
-					"type": "boolean"
 				}
 			}
 		},
@@ -20911,23 +20901,6 @@
 				}
 			}
 		},
-		"codersdk.SecretRequirementStatus": {
-			"type": "object",
-			"properties": {
-				"env": {
-					"type": "string"
-				},
-				"file": {
-					"type": "string"
-				},
-				"help_message": {
-					"type": "string"
-				},
-				"satisfied": {
-					"type": "boolean"
-				}
-			}
-		},
 		"codersdk.ServerSentEvent": {
 			"type": "object",
 			"properties": {