[configcompression] Use if instead of switch on UnmarshalText

[mx-psi]

          nit: Sorry, but my mind goes crazy when I see a switch used like an if :)) Can we fix this probably in a separate PR :)

Originally posted by @bogdandrutu in https://github.com/open-telemetry/opentelemetry-collector/pull/9416#discussion_r1474920110

[mx-psi]

I guess ideally we would have a linter for this

[mx-psi]

I don't think this is needed for 1.0 since it is an internal implementation detail, I am removing from the milestone

[TylerHelmuth]

I agree that this is not required for a 1.0 release.

[AkhigbeEromo]

Hello @TylerHelmuth @mx-psi , i would like to work on this issue