Migrate to new MP API, fix failing examples

[DanielYang59]

• Migrate import of MPRester from legacy pymatgen.ext.matproj to mp_api, also add mp_api to dependency install step, as previous example implicitly depends on either legacy or new MPRester but doesn't install it (MPRester would be None).
• Bump pre-commit hooks
• Clean up test.yml
• Fix repo secret PMG_MAPI_KEY config, need maintainer help, [Dev/CI] Repo secret PMG_MAPI_KEY missing or set to legacy key? #62
• Update install command to pip install -U pymatgen 2a986bd:

  matgenb/README.md

  Lines 82 to 83 in 53abce7

  	# Uncomment the subsequent lines in this cell to install dependencies for Google Colab.
  	# !pip install pymatgen==2022.2.27

• Remove from __future__ import annotations and mypy from pre-commit 1c4c9f9 because notebooks are not annotated

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Fix failing examples

• 2018-03-09-Computing the Reaction Diagram between Two Compounds (neither new/legacy API worked)
• 2019-03-11-Interface Reactions
• 2023-03-10-Plotting a Pourbaix Diagram-new
• 2023-12-31-FHI-aims-example

Taken over or tracked elsewhere

• 2018-03-14-Plotting COHP from LOBSTER (Cannot init Cohpcar in matgenb example notebook: ValueError: setting an array element with a sequence. materialsproject/pymatgen#4215)
• 2019-01-11-How to plot and evaluate output files from Lobster (Cannot init Cohpcar in matgenb example notebook: ValueError: setting an array element with a sequence. materialsproject/pymatgen#4215)

Examples only work with legacy MP API key

• Might need to skip tests using legacy MP API keys only (or check for replacement)?
• 2017-12-15-Plotting a Pourbaix Diagram

[DanielYang59]

This was related to a build time isolation issue from BoltzTraP2 side, have been fixed now

[DanielYang59]

TODO: either use notest pattern to ignore file, or insert pytest.skip mark (not sure how to achieve this for ipynb though)