shell-completion: offer --json= for the standalone verbs that support it

Several verbs in the STANDALONE bucket accept --json=, but that bucket only
offers --help --version --system --user --global --no-pager, so completion
never suggested the option for them.

Split those verbs out into a new STANDALONE_JSON bucket that additionally
offers --json=off/pretty/short. The verbs are moved rather than copied, as
${VERBS[*]} is used to complete the verb list itself.

shell-completion/bash/systemd-analyze

@@ -77,7 +77,8 @@ _systemd_analyze() {
     )
 
     local -A VERBS=(
-        [STANDALONE]='time blame unit-files unit-paths exit-status compare-versions timestamp timespan pcrs nvpcrs srk has-tpm2 identify-tpm2 smbios11 chid image-policy'
+        [STANDALONE]='time unit-files unit-paths compare-versions timestamp timespan srk has-tpm2 smbios11 image-policy'
+        [STANDALONE_JSON]='blame exit-status pcrs nvpcrs identify-tpm2 chid'
         [CRITICAL_CHAIN]='critical-chain'
         [DOT]='dot'
         [DUMP]='dump'
@@ -153,6 +154,11 @@ _systemd_analyze() {
             comps='--help --version --system --user --global --no-pager'
         fi
 
+    elif __contains_word "$verb" ${VERBS[STANDALONE_JSON]}; then
+        if [[ $cur = -* ]]; then
+            comps='--help --version --system --user --global --no-pager --json=off --json=pretty --json=short'
+        fi
+
     elif __contains_word "$verb" ${VERBS[CRITICAL_CHAIN]}; then
         if [[ $cur = -* ]]; then
             comps='--help --version --system --user --fuzz --no-pager'