fix(release): change ngDevMode to isDevMode()

[Polatrite]

Angular best practice for checking dev mode, without conflicting global that doesn't pass Typescript's lib check.

Resolves #186, resolves #178

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: CONTRIBUTING.md#commit
• [-] Tests for the changes have been added (for bug fixes / features)
• [-] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Currently ngDevMode is declared as a global const with a signature that doesn't match the same global const exported by Angular. This results in TypeScript errors when tsconfig.json::compilerOptions.skipLibCheck is set to false.

Issue Number: N/A

What is the new behavior?

Instead of using ngDevMode, we use Angular's isDevMode() function to determine dev mode status, then take identical action as before.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

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[arturovt]

Angular does not declare best practices on using isDevMode() as this function returns ngDevMode, the solution was only to remove the module augmentation (declare ...).