Qual: Ignore most shellcheck annotations, fix some (#27452)

# Qual: Ignore most shellcheck annotations, fix some

Most shellcheck annotations are ignored - this is to make sure that ci
can work for existing scripts.

Some fixes were applied.

pre-commit script was beautyfied by temporarily suppressing the IFS= expression on 2 lines.

dev/tools/fixsnakeCaseToCamelCase.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+# shellcheck disable=2002,2004,2028,2034,2053,2068,2086,2116,2143,2207
+
 ## Need "rpl" package
 RPL_INSTALLED=$(dpkg -s rpl)
 if [[ -z ${RPL_INSTALLED} ]]; then