fix: properly retrieve nested folder resources

[dcshzj]

Problem

Nested folder resources are not properly retrieved, which causes the casing in the index page to not be correct for those cases.

Solution

Breaking Changes

• Yes - this PR contains breaking changes
• No - this PR is backwards compatible

Bug Fixes:

• Correctly retrieve the folder resource using the full permalink instead.

Tests

• Repeat fix: allow editing of published collection links #1000 but for nested folders.

[datadog-opengovsg]

Datadog Report

Branch report: fix/handle-nested-folders
Commit report: 371dd43
Test service: isomer-studio

✅ 0 Failed, 257 Passed, 36 Skipped, 49.76s Total Time
➡️ Test Sessions change in coverage: 1 no change

[seaerchin]

just for my understanding - previously this didn't work because we rely on fullPermalink === danglingDirectory, which meant that nested folders wouldn't work

now, since we use a full permalink comparison, the folder itself would match the permalink, even if nested?

[dcshzj]

@seaerchin yup, danglingDirectory is only the last part of the permalink (i.e. the slug, which is senior-management if the full permalink is about-us/senior-management). We can immediately tell this is true because the previous code does a replacement of dashes to spaces and capitalise the first letter to be the title, so means danglingDirectory is only the last part.

Now, it's doing a full comparison using the permalink (which we actually already are doing a few lines down, which I now moved up). This guarantees that we are getting the actual folder resource that we want, which we can then extract the title from.