Merge #18673: scripted-diff: Sort test includes

fa4632c41714dfaa699bacc6a947d72668a4deef test: Move boost/stdlib includes last (MarcoFalke)
fa488f131fd4f5bab0d01376c5a5013306f1abcd scripted-diff: Bump copyright headers (MarcoFalke)
fac5c373006a9e4bcbb56843bb85f1aca4d87599 scripted-diff: Sort test includes (MarcoFalke)

Pull request description:

  When writing tests, often includes need to be added or removed. Currently the list of includes is not sorted, so developers that write tests and have `clang-format` installed will either have an unrelated change (sorting) included in their commit or they will have to manually undo the sort.

  This pull preempts both issues by just sorting all includes in one commit.

  Please be aware that this is **NOT** a change to policy to enforce clang-format or any other developer guideline or process. Developers are free to use whatever tool they want, see also #18651.

  Edit: Also includes a commit to bump the copyright headers, so that the touched files don't need to be touched again for that.

ACKs for top commit:
  practicalswift:
    ACK fa4632c41714dfaa699bacc6a947d72668a4deef
  jonatack:
    ACK fa4632c41714dfaa, light review and sanity checks with gcc build and clang fuzz build

Tree-SHA512: 130a8d073a379ba556b1e64104d37c46b671425c0aef0ed725fd60156a95e8dc83fb6f0b5330b2f8152cf5daaf3983b4aca5e75812598f2626c39fd12b88b180

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