ROX-27747: Include CIDR block modal when filtering

[sachaudh]

Description

This PR makes a few changes to add a CIDR block using the modal within the External flows section. We are using React context for this because of the following reason:

The modal component is rendered within NetworkGraphPage, 6 levels up from the ExternalFlows component. We don't want to prop drill that many levels. I'd consider prop drilling for simplicity if it were 2 (maybe even 3). Since it's 6 levels deep, I think it warrants the use of React Context.

We also needed to pass the External IP value to the modal to display as the initial value when the modal opens. The React Context for the CIDR form modal will keep the state to allow for that behavior.

User-facing documentation

• CHANGELOG is updated OR update is not needed
• documentation PR is created and is linked above OR is not needed

Testing and quality

• the change is production ready: the change is GA or otherwise the functionality is gated by a feature flag
• CI results are inspected

Automated testing

• added unit tests
• added e2e tests
• added regression tests
• added compatibility tests
• modified existing tests

How I validated my change

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.85%. Comparing base (99dd5c2) to head (31a122a).

Additional details and impacted files

@@              Coverage Diff              @@
##           ROX-27744   #13944      +/-   ##
=============================================
- Coverage      48.85%   48.85%   -0.01%     
=============================================
  Files           2496     2496              
  Lines         180747   180747              
=============================================
- Hits           88301    88295       -6     
- Misses         85433    85437       +4     
- Partials        7013     7015       +2     

Flag	Coverage Δ
go-unit-tests	48.85% <ø> (-0.01%)	⬇️

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