Remove unnecessary checks for flags by marking them `required` in `cobra.Command` instance

[Harsh4902]

Reason/Context

• Every command implementation contains some checks for required flags like --microcksURL, --keycloakClientId, --keycloakClientSecret.
• We can remove this extra checks.

Description

• By using MarkFlagRequired functionality of cobra.Command we can remove all manual checks.

Implementation ideas

No response

[lbroudoux]

Completed with the merge of #129