Prevent duplicate labels

[SorsOps]

Addresses #45

There are 2 real changes here and I am happy to amend based on feedback

1. Changing the hardcoded tooljet-postgrest labels to rather rely on the release names instead so that multiple helm releases could be deployed into the same namespace
2. Removing the selectorLabels from common labels as they do not appear to be common and are actually specific to the tooljet only portion of the system, not the "external" systems like postgrest. I've readded the selector labels to where ever I found the common labels to be used explicitly to prevent regression however

If anyone adds testing to this repo I'm happy to update to show that the labels should be as expected

[SorsOps]

@adishM98 bump

[adishM98]

@SorsOps Sure, Will test it once from our end and release it.

[slancerk]

Test passed.

[SorsOps]

@adishM98 Could you merge when you have time ?

[SorsOps]

@adishM98 bump