Cluster workflows

[Diolor]

This PR closes #issue_number

Description

1. Clusters mandatory CI jobs (were possible) into two groups: main branch / PRs. Both groups use 3 reusable workflows. Parameters were added where needed (e.g. link check and url check).

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   Before (e.g. Revise code samples and dynamic analysis instructions #3670):

   

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   After (this branch):

   

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   And then analysing the workflow's jobs in a single view:

   

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   For demo purposes, in this branch we run both PR and master branch related Workflows. Tested here. The first group will run on master branch. The second group in all other PRs.
   

   Jobs will run in parallel. The workflow will auto-cancel if a new commit on the same branch is pushed.

2. Reuse logic for ios + android demos into .github/scripts/generate-demo-matrix.sh

3. Update some actions like actions/setup-python@v5

4. Adds better names in the jobs I touched, such as name: URL Link Check

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AI Tool Disclosure

• This contribution includes AI-generated content.

If AI tools were used to generate or substantially modify code or text, complete the following.

• AI tools used: Claude 4.6
• Prompt summary: Move check/link workflows intro reusable ones.