Adds skip_templating feature (#167)

[rwittrick]

Description

Fixes #167.

Adds the top level skip_templating config to boilerplate.yaml. In terms of config, it works the same as skip_files. skip_templating will copy any file matched in the config without rendering or templating it. skip_files takes precedence if a path is listed in both.

• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.
• Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes (draft)

Added skip_templating feature.

[denis256]

        --- FAIL: TestExamplesAsRemoteTemplate/group/skip-templating (5.73s)
        --- PASS: TestExamples/skip-not-path-multiple/skip-not-path-multiple-missing-key-error (0.00s)
    --- FAIL: TestExamples/skip-templating (0.02s)
        --- FAIL: TestExamples/skip-templating/skip-templating-missing-key-invalid (0.01s)
        --- FAIL: TestExamples/skip-templating/skip-templating-missing-key-zero (0.01s)
        --- FAIL: TestExamples/skip-templating/skip-templating-missing-key-error (0.01s)

[rwittrick]

I updated the typo in the tests with a new commit.

I'll look further into running the tests locally. They fail as the first suite use a hard coded reference to the gruntwork repo URL with a parameterized gitref, but for an outside committer the branch isn't available in that repo