fix: handle environment documentation pagination

[Zaimwa9]

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• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
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closes#204

Changes

• Iterates over api/v1/environment-document until all pages have been consumed
• consolidate pages into a single environment document
• log a warning if total time exceeded polling interval

How did you test this code?

• added test

// Using staging-api with lower body_size constraints with a dummy app logging
nextMatch /api/v1/environment-document/?page_id=identity_override:60074:3035e1fa-320a-48ec-822c-5ed30f839dfb
nextMatch /api/v1/environment-document/?page_id=identity_override:60074:331a5b10-6cd6-41df-95f9-4049a1c5dadf
nextMatch /api/v1/environment-document/?page_id=identity_override:60074:35aa8f9a-e82c-429c-90ea-26f0e8fa6da1
nextMatch /api/v1/environment-document/?page_id=identity_override:60074:3861ff9a-e95e-4304-9f95-658f3ccf4710
nextMatch /api/v1/environment-document/?page_id=identity_override:60074:3b5a58a1-e678-4c37-9e07-22303ce2e4a8
documents-pages 21
Flags numbers: 2

[gagantrivedi]

Looks good, just some questions