scripts: use end-of-options marker in cd, mkdir, mv, sha256sum commands

Where missing. To avoid passing an option by accident.

End-of-option marker (`--`) is not POSIX, but most of these scripts are
internal and/or CI-focused, where this is fine. `maketgz` and
`verify-release` are meant for public use, and I asses this is fine too,
but let us know if this causes issues in real world envs.

Also:
- maketgz: pass args with `:?` to `rm -rf`, where missing.
  Cannot cause an actual issue with current code.
- verified `cp`, `rm` instances too, but none were affected.
- tests/cmake/test.sh: replace `$PWD` with `$(pwd)` for sturdiness.
- appveyor.sh: replace `$PWD` with `$(pwd)` for sturdiness.

Assisted-by: Dan Fandrich
Follow-up to 6aab1dc263 #19450

Closes #22150

.github/scripts/codespell.sh

@@ -5,7 +5,7 @@
 
 set -eu
 
-cd "$(dirname "${0}")"/../..
+cd -- "$(dirname "${0}")"/../..
 
 git ls-files -z | xargs -0 -r \
 codespell \

.github/scripts/shellcheck.sh

@@ -5,7 +5,7 @@
 
 set -eu
 
-cd "$(dirname "${0}")"/../..
+cd -- "$(dirname "${0}")"/../..
 
 git grep -z -l -E '^#!(/usr/bin/env bash|/bin/sh|/bin/bash)' | xargs -0 -r \
 shellcheck --exclude=1091,2248 \

.github/scripts/typos.sh

@@ -5,7 +5,7 @@
 
 set -eu
 
-cd "$(dirname "${0}")"/../..
+cd -- "$(dirname "${0}")"/../..
 
 git ls-files | typos \
   --isolated \

.github/scripts/yamlcheck.sh

@@ -5,7 +5,7 @@
 
 set -eu
 
-cd "$(dirname "${0}")"/../..
+cd -- "$(dirname "${0}")"/../..
 
 git ls-files '*.yaml' '*.yml' -z | xargs -0 -r \
 yamllint \