fix: add missing validation for group name to `shield:user addgroup`/`removegroup` · codeigniter4/shield@c003977

Took 0.69s from 0.50s limit to run Tests\\Unit\\UserIdentityModelTest::testForceMultiplePasswordReset

Took 0.69s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisterActionSuccess

Took 0.64s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisteredAndSessionExpiredAndLogin

Took 0.63s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisterRedirectsToActionIfDefined

Took 0.63s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisterActionSuccessWithNoEmailLogin

Took 0.62s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisteredButNotActivatedAndRegisterAgain

Took 0.62s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisteredButNotActivatedAndLogin

Took 0.61s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisterActionWithBadEmailValue

Took 0.54s from 0.50s limit to run Tests\\Unit\\DictionaryValidatorTest::testCheckTrueOnNotFound

Took 0.53s from 0.50s limit to run Tests\\Unit\\PasswordsTest::testHash

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