Removing `run-tests.py` file. #9880

Job	Run time
style	24s
Doctests (ubuntu-latest / Python 3.11)	5m 10s
Example notebooks (ubuntu-latest / Python 3.12)	18m 54s
Example scripts (ubuntu-latest / Python 3.12)	13m 16s
Tests (ubuntu-latest / Python 3.9)	35m 4s
Tests (ubuntu-latest / Python 3.10)	35m 11s
Tests (ubuntu-latest / Python 3.11)	31m 56s
Tests (ubuntu-latest / Python 3.12)	37m 32s
Tests (macos-12 / Python 3.9)	23m 27s
Tests (macos-12 / Python 3.10)	20m 39s
Tests (macos-12 / Python 3.11)	20m 21s
Tests (macos-12 / Python 3.12)	23m 10s
Tests (macos-14 / Python 3.9)	12m 44s
Tests (macos-14 / Python 3.10)	11m 19s
Tests (macos-14 / Python 3.11)	20m 33s
Tests (macos-14 / Python 3.12)	10m 53s
Tests (windows-latest / Python 3.9)	33m 4s
Tests (windows-latest / Python 3.10)	32m 32s
Tests (windows-latest / Python 3.11)	31m 51s
Tests (windows-latest / Python 3.12)	28m 48s
	7h 26m 48s

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