fix: add type checking to message sanitation

[merll]

This PR adds a fix and regression test to a utility function that removes Git credentials from log output.

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🔴	Statements	50.52% (+0.05% 🔼)	2277/4507
🔴	Branches	35.22% (+0.19% 🔼)	368/1045
🔴	Functions	42.55% (+0.16% 🔼)	417/980
🔴	Lines	50.9% (+0.06% 🔼)	2140/4204

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🔴	git.ts	15.22% (-0.05% 🔻)	6.58%	7.32%	15.87% (-0.06% 🔻)

Test suite run success

332 tests passing in 12 suites.

Report generated by 🧪jest coverage report action from 32bfb90

[ferruhcihan]

LGTM