test: remove shellcheck severity filter, add explicit disables instead

.pre-commit-config.yaml

@@ -34,10 +34,7 @@ repos:
     rev: v0.7.1.1
     hooks:
       - id: shellcheck
-        args: [
-          -S, warning, # https://github.com/koalaman/shellcheck/issues/1554
-          -f, gcc,
-        ]
+        args: [-f, gcc]
         types: [text]
         files: ^(bash_completion|completions/.+|test/run*|.+\.sh(\.in)?)$
         exclude: completions/(\.gitignore|Makefile.*)$

.shellcheckrc

@@ -2,6 +2,23 @@ shell=bash
 disable=SC1090  # not really fixable usually (ever?)
 disable=SC2034  # for localizing variables set in called functions
 disable=SC2128  # intentional style choice
-disable=SC2155  # TODO
 disable=SC2206  # suggested alternatives fail in posix mode or use temp files
 disable=SC2207  # suggested alternatives fail in posix mode or use temp files
+
+# These disables are to be investigated and decided
+
+disable=SC1003
+disable=SC1004
+disable=SC2002
+disable=SC2004
+disable=SC2006
+disable=SC2015
+disable=SC2016
+disable=SC2035
+disable=SC2086
+disable=SC2102
+disable=SC2116
+disable=SC2155
+disable=SC2162
+disable=SC2231
+disable=SC2236