add str method to JinjaTemplateError #1986

Job	Run time
Detect which file has changed	5s
prepare-environment / prepare	3s
python-lint	10s
markdown-lint	0s
uv-lock-check	0s
yaml-lint	0s
action-lint	0s
integration-tests-latest-infrahub	-1s
documentation	-1s
validate-documentation-style	-1s
unit-tests	-1s
validate-generated-documentation	-1s
	13s

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