chore: standardize FEATURE_ENABLE_CHAT_V2_ENDPOINT variable across environment files

Author: mraman-2U

.env

@@ -52,4 +52,4 @@ OPTIMIZELY_FULL_STACK_SDK_KEY=''
 SHOW_UNGRADED_ASSIGNMENT_PROGRESS=''
 # Fallback in local style files
 PARAGON_THEME_URLS={}
-FEATURE_ENABLE_CHAT_V2_ENDPOINT=''
+FEATURE_ENABLE_CHAT_V2_ENDPOINT=''

.env.development

@@ -54,4 +54,4 @@ OPTIMIZELY_FULL_STACK_SDK_KEY=''
 SHOW_UNGRADED_ASSIGNMENT_PROGRESS=''
 # Fallback in local style files
 PARAGON_THEME_URLS={}
-FEATURE_ENABLE_CHAT_V2_ENDPOINT='false'
+FEATURE_ENABLE_CHAT_V2_ENDPOINT='false'

.env.test

@@ -50,4 +50,4 @@ USER_INFO_COOKIE_NAME='edx-user-info'
 PRIVACY_POLICY_URL='http://localhost:18000/privacy'
 SHOW_UNGRADED_ASSIGNMENT_PROGRESS=''
 ENTERPRISE_LEARNER_PORTAL_URL='http://localhost:Enterprise'
-FEATURE_ENABLE_CHAT_V2_ENDPOINT='false'
+FEATURE_ENABLE_CHAT_V2_ENDPOINT='false'