Remove classNames and clsx package and use a utility function to achieve the same

[rithviknishad]

• Remove classNames package.
• Make a utility method classNames

Migrating clsx to new classNames under the directories:

(sub-issues will be created to self-assign)

• Migrate clsx under src/CAREUI/** #4161
• Migrate clsx to new classNames utility under the directory: src/Components/Common/** #4162
• Migrate clsx to new classNames utility under the directory: src/Components/Facility/** #4163
• Migrate clsx to new classNames utility under the directory: src/Components/Consultations/** #4164
• Migrate clsx to new classNames utility under the directory: src/Components/ExternalResults/** #4165
• Migrate clsx to new classNames utility under the directory: src/Components/Notifications/** #4166
• Migrate clsx to new classNames utility under the directory: src/Components/Patient/** #4167
• Migrate clsx to new classNames utility under the directory: src/Components/Resource/** #4168
• Migrate clsx to new classNames utility under the directory: src/Components/Shifting/** #4169
• Migrate clsx to new classNames utility under the directory: src/Components/Users/** #4170

Once all the above is completed:

• Remove clsx package