Fix Python formatting to get rid of linter errors from make lint-server

[jiridanek]

What changes were proposed in this pull request?

This fixes the following errors, that were previously reported

make lint-server
python3 -m flake8 elyra .github
elyra/tests/metadata/test_metadata.py:707:28: E226 missing whitespace around arithmetic operator
elyra/tests/util/test_kubernetes.py:90:47: E226 missing whitespace around arithmetic operator
elyra/tests/util/test_kubernetes.py:119:41: E226 missing whitespace around arithmetic operator
elyra/tests/util/test_kubernetes.py:119:51: E226 missing whitespace around arithmetic operator
elyra/tests/util/test_kubernetes.py:178:52: E226 missing whitespace around arithmetic operator
elyra/tests/util/test_kubernetes.py:207:46: E226 missing whitespace around arithmetic operator
elyra/tests/util/test_kubernetes.py:207:56: E226 missing whitespace around arithmetic operator
make: *** [lint-server] Error 1

How was this pull request tested?

Run the command that was previously failing in CI

• https://github.com/jiridanek/elyra/actions/runs/12473128947/job/34813104334#step:3:1

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