Fix scripts without shebang start.

[bigkevmcd]

Changes

This fixes some remaining scripts in example TaskRuns that are missing shebang
scripts, triggering an error if applied.

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Release Notes

Fix example TaskRuns with missing shebangs in scripts.

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[vdemeester]

@bigkevmcd I think those are meant to test (and make sure) that script works without shebang (in master). As written in #1904 (comment), 0.9.x needs shebang, but starting from 0.10 (soon to be released), you won't need it (if it's a bash script), as #1691 implemented (and #1736).

[tekton-robot]

@bigkevmcd: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-tekton-pipeline-integration-tests	be8d600	link	/test pull-tekton-pipeline-integration-tests

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