[MOSIP-31982] Enabling and disabling kafka bean

[Neha2365]

No description provided.

[vishwa-vyom]

@Neha2365 I checked on the PR, look ok except for one point
we are check for bean null and taking the decision to notify or not
but what if the bean was null for other reasons ?
should we rather check with the configuration directly ?
and have a postconstruct to check if the config is true and the bean is null and throw an error
this is because we have told required is false in autowire and I am assuming it will not hinder the startup