chore: adopt create engine's 'migrate' mode (#1778)

## PR Checklist

- [x] Addresses an existing open issue: fixes #1764, fixes #1765
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/create-typescript-app/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/create-typescript-app/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

Adds Block-level migrations with `migrate()`. These are pretty much all
`rm` / `rm -rf` scripts, which now run in a command phase before
installation.

Includes some more snapshot tests for Blocks too.

Corresponding `create` PR:
bingo-js/bingo#69

💖

Author: JoshuaKGoldberg

package.json

@@ -44,7 +44,7 @@
 		"@clack/prompts": "^0.8.2",
 		"@prettier/sync": "^0.5.2",
 		"chalk": "^5.3.0",
-		"create": "0.1.0-alpha.6",
+		"create": "0.1.0-alpha.7",
 		"execa": "^9.5.1",
 		"git-remote-origin-url": "^4.0.0",
 		"git-url-parse": "^16.0.0",
@@ -82,7 +82,7 @@
 		"all-contributors-cli": "6.26.1",
 		"c8": "10.1.2",
 		"console-fail-test": "0.5.0",
-		"create-testers": "0.1.0-alpha.6",
+		"create-testers": "0.1.0-alpha.7",
 		"cspell": "8.16.1",
 		"eslint": "9.16.0",
 		"eslint-plugin-jsdoc": "50.6.0",

pnpm-lock.yaml

@@ -52,7 +52,7 @@ describe("blockAllContributors", () => {
 			        "npx -y all-contributors-cli generate",
 			        "npx -y all-contributors-cli add test-owner code,content,docs,ideas,infra,maintenance,projectManagement,tool",
 			      ],
-			      "phase": 2,
+			      "phase": 3,
 			    },
 			  ],
 			}
@@ -119,7 +119,7 @@ describe("blockAllContributors", () => {
 			        "npx -y all-contributors-cli generate",
 			        "npx -y all-contributors-cli add test-owner code,content,docs,ideas,infra,maintenance,projectManagement,tool",
 			      ],
-			      "phase": 2,
+			      "phase": 3,
 			    },
 			  ],
 			}