CHORE: Update codacy ignore file

[dipinknair]

Ignore issues in examples folder which often shows issue with Mechanical APIs

eg: https://app.codacy.com/gh/ansys/pymechanical/pull-requests/1260

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.08% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (252a0d9)	2544	2187	85.97%
Head commit (6010ed3)	2544 (+0)	2185 (-2)	85.89% (-0.08%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1261)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[MaxJPRey]

LGTM.