Document Tree - Performance Issues when Expanding All Files

[KyEggleston]

Describe the bug in current situation
A clear and concise description of what the bug is.

In the Redaction App, when expanding all files in the package (i.e., to show all the pages) in the left pane / document tree, performance is significantly impacted on larger requests.

For example, on FOR-2023-30509, which contains 286 files, when selecting to expand all in the left pane / document tree, performance is impacted when trying to perform further actions in the left pane / document tree.

Selecting pages, apply page flags, expanding or collapsing files all take seconds to respond.

This ticket is to investigate performance related challenges/improvements related to this feature.

Link bug to the User Story

#4432

Impact of this bug
Describe the impact, i.e. what the impact is, and number of users impacted.

Low

Chance of Occurring (high/medium/low/very low)

Medium

Pre Conditions: which Env, any pre-requesites or assumptions to execute steps?

PROD and TEST

Steps to Reproduce
Steps to reproduce the behavior:

1. Go to FOR-2023-30509 in the Redaction App
2. Expand all files in the left pane / document tree
3. Click a page in the package, or right click to bring up the page flag context menu
4. See performance issues

Actual/ observed behaviour/ results

Performance impacted when expanding all files

Expected behaviour
A clear and concise description of what you expected to happen. Use the gherking language.

Screenshots/ Visual Reference/ Source
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