Fix %run_viz using old process in jupyter notebook

[ravi-kumar-pilla]

Description

Resolves #1823

NOTE: I increased the max attempts of ports to 10 but something seems off with the entire process. So the question is should we treat each jupyter cell a separate viz instance when someone does %run_viz ? With the current approach, the issue of using old running process is fixed but the users can run %run_viz only 10 times in a notebook session

Development notes

• Add _find_available_port logic placed in run command to %run_viz
• Remove allocate_port method

QA notes

• All tests should pass
• You can test %run_viz on notebook and it should use different ports for different cell runs.

Checklist

• Read the contributing guidelines
• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added new entries to the RELEASE.md file
• Added tests to cover my changes

[rashidakanchwala]

hi Ravi, i am debating whether we should spend more time on this. %run_viz is not used much. It was broken for 6-7 months and nobody complained. Also, given with the new way to 'Visualise pipelines in notebooks', this might become old Let's increase it to max 10 and see if we get users complaining -- then we can decide what to do. wdyt @astrojuanlu ?

[astrojuanlu]

Agreed with @rashidakanchwala , in line with what I said in #1823 (comment), probably we will be de-emphasizing this over time. Still, if there's no more work needed here and given that this actually removed code 😄 let's merge!