[TASK] Remove undocumented composerInstall (#1416)

The project doesn't have a `composer.lock`. That's why one should use
`composer update` instead of `composer lock`.
This can be done by using the existing `-s composer` and appending
`update.
Furthermore, the command itself was not documented or used anyway.

Relates: #1412

Build/Scripts/runTests.sh

@@ -218,7 +218,7 @@ Options:
             - 16    maintained until 2028-11-09
 
     -t <11.5|12.4>
-        Only with -s composerInstall|composerUpdateMin|composerUpdateMax
+        Only with -s composerUpdateMin|composerUpdateMax
         Specifies the TYPO3 CORE Version to be used
             - 11.5: use TYPO3 v11 with typo3/cms-composer-installers ^3
             - 12.4: (default) use TYPO3 v12 with typo3/cms-composer-installers ^5
@@ -506,11 +506,6 @@ case ${TEST_SUITE} in
         ${CONTAINER_BIN} run ${CONTAINER_COMMON_PARAMS} --name composer-command-${SUFFIX} -e COMPOSER_CACHE_DIR=.cache/composer -e COMPOSER_ROOT_VERSION=${COMPOSER_ROOT_VERSION} ${IMAGE_PHP} "${COMMAND_PARTS[@]}"
         SUITE_EXIT_CODE=$?
         ;;
-    composerInstall)
-        COMMAND_PARTS=(composer install "$@")
-        ${CONTAINER_BIN} run ${CONTAINER_COMMON_PARAMS} --name composer-install-${SUFFIX} -e COMPOSER_CACHE_DIR=.cache/composer -e COMPOSER_ROOT_VERSION=${COMPOSER_ROOT_VERSION} ${IMAGE_PHP} "${COMMAND_PARTS[@]}"
-        SUITE_EXIT_CODE=$?
-        ;;
     composerUpdateMax)
         COMMAND="composer config --unset platform.php; composer require --no-ansi --no-interaction --no-progress --no-install typo3/cms-core:"^${CORE_VERSION}"; composer update --no-progress --no-interaction; composer dumpautoload; composer show"
         ${CONTAINER_BIN} run ${CONTAINER_COMMON_PARAMS} --name composer-install-max-${SUFFIX} -e COMPOSER_CACHE_DIR=.cache/composer -e COMPOSER_ROOT_VERSION=${COMPOSER_ROOT_VERSION} ${IMAGE_PHP} /bin/sh -c "${COMMAND}"