Update pulsar recipe

[MRegeard]

This PR update the pulsar recipe to Gammapy version 1.2 and PINT version 1.0. I also corrected the issue with phase not in the event table print at the end of the recipe.

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[AtreyeeS]

Thanks a lot @MRegeard ! This is useful
Since the diff is not very readable, I leave comments here

1. Please clear the outputs
2. in 0. Dependencies and Imports, update gammapy-1.0-environment.yml to 1.2
3. In the target_position = SkyCoord()... do we need the ra and dec to this precision?
4. In Section 2.1, where you mention checking the START and FINISH entries, maybe you can show how to do that, and that it is valid for this run (using the GTI for the run)
5. The point with deleting the JUMP parameter has to be explained better. Open the file, comment it out, save it, etc. Isn't there any better way?
6. remove the blank cell at the end

[MRegeard]

Thanks @AtreyeeS for you comments.

1. Done
2. Done
3. Done
4. I described a little bit better this part and show how one can check for time using tstart and tstop of the observation.
5. I also explain a little bit better this part. Unfortunately, we cannot really do anything with this, it cause an error on PINT side. I also try to use the Crab ephemeris provided by Fermi 3PC, but it is even worse because it is written as TCB, which PINT does not support. One would have to use Tempo2 to convert it to TDB.
6. Done.

[Astro-Kirsty]

Thanks @MRegeard. I've had a look and made some comments. I will also send you some comments via slack which were I was not able to make review comments.
Thanks again!

[MRegeard]

@Astro-Kirsty, Thanks you very much for your review !

[AtreyeeS]

Thank you @MRegeard ! No further comments. If the comments by @Astro-Kirsty have been addressed, we can merge

[MRegeard]

We can merge this PR, what do you think @AtreyeeS @registerrier ?

[registerrier]

Thanks @MRegeard . See few inline comments.

[registerrier]

What is this gammapy-pint-environment.yml ?

[MRegeard]

I don't really know. I think that is was the original env file that was presented to the user. But then we also need this env.yml for the CI. In the end they are the same so I could make gammapy-pint-environment.yml a simlink to env.