refactor(layers-bounds) - Quick PR to see if calculate bounds can be simplified now

[Alex-NRCan]

Description

This PR is dependent on PR #2245 This PR replaces 5 calculateBounds() calls, distributed in different region of code, with a simple get bounds from the store instead.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Hosted June 14th, 10h00: https://alex-nrcan.github.io/geoview/

Checklist:

• [x] I have build (rush build) and deploy (rush host) my PR
• [ ] I have connected the issues(s) to this PR
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [ ] I have created new issue(s) related to the outcome of this PR is needed
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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This change is