Closes gh-25271

* pr/25266:
  Update copyright of changes files
  Polish

Closes gh-25266

See gh-25266

See gh-25266

Closes gh-25259

Closes gh-24894

Closes gh-25258

Closes gh-25257

Closes gh-25254

Closes gh-25253

Closes gh-25252

Closes gh-25251

Closes gh-25250

Closes gh-25255

Closes gh-25249

Previously, UpgradeApplicator would open build.gradle
using open options that left the fields existing content intact. It
would then write the new content at the beginning of the file. If
the new content was n bytes shorter than the existing content, this
would leave n bytes of the existing content at the end of the file.

This commit updates UpgradeApplicator to truncate the existing file
when it opens it. This ensures that the existing content is
completely replaced by the new content, irrespective of their lengths.

Closes gh-25256

Closes gh-25248

Closes gh-25247

Closes gh-25246

Closes gh-25245

Closes gh-25244

Closes gh-25243

Closes gh-25242

Closes gh-25241

Closes gh-25240

Closes gh-25239

Closes gh-25238

Closes gh-25237

Closes gh-25236

Closes gh-25235

Closes gh-25234

Closes gh-25233

Closes gh-25232

Closes gh-25231

Closes gh-25230

Closes gh-25229

Closes gh-25228

Closes gh-25227