MBP-622: Hardening the method for getting pattern index files

[danmacpherson]

There's a bug in Hugo versions in the range of 0.123.0 to 0.123.4 that causes our patterns browser to render incorrectly. It seems that the all levels of child pages in a top-level Section consider themselves to be that section instead of sub-sections. So instead of using "Section" to identify pattern index pages, we'll now determine which pages are index pages using the parent path. Anything that uses "/patterns" as a parent path is considered an index file in our pattern browser.

[openshift-ci-robot]

@danmacpherson: This pull request references MBP-622 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target the "4.16.0" version, but no target version was set.

In response to this:

There's a bug in Hugo versions in the range of 0.123.0 to 0.123.4 that causes our patterns browser to render incorrectly. It seems that the all levels of child pages in a top-level Section consider themselves to be that section instead of sub-sections. So instead of using "Section" to identify pattern index pages, we'll now determine which pages are index pages using the parent path. Anything that uses "/patterns" as a parent path is considered an index file in our pattern browser.

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[mbaldessari]

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[danmacpherson]

Trying a different fix to harden the patterns index page detection since the previous fix didn't work on older versions of Hugo. For this fix, we just add a filter to only include pages that have "branch" BundleType.

Tested on Hugo 0.121.0, 0.122.0, 0.123.0, 0.123.4, 0.123.5, and latest (0.123.7). All seems to work.