ci: label-based triggers seems to be unreliable

[ppawlowski]

Description

The workflow responsible for createing pre-staging environments relies on the deploy:pr label. Recently, this approach started to be unreliable. Developers had to manually remove and re-add the label in order to trigger the pipeline.
Since we deploy every change to pre-staging (with couple of exceptions), label-based trigger could be replaced with several simple conditionals.
At this moment we do not create pre-staging, if:

• PR is created by dependabot
• PR is created by user outside FlowFuse Github organisation
• PR contains only documentation changes

The goal of this task is to fidn the cause of the issues or replace label-based approach with conditional statements.

Epic/Story

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