Revert "Pull router_js into the Ember monorepo"

[NullVoxPopuli]

Reverts #21211

just testing browserstack flakiness

[github-actions]

📊 Package size report   -0.38%↓

File	Before (Size / Brotli)	After (Size / Brotli)
dist/ember.debug.js	2.1 MB / 321 kB	-0.09%↓2.1 MB / -0.1%↓320.7 kB
dist/ember.debug.js.map	3.4 MB / 635.1 kB	-0.37%↓3.4 MB / -0.4%↓632.6 kB
dist/ember.prod.js	1.9 MB / 291.8 kB	-0.1%↓1.9 MB / -0.17%↓291.3 kB
dist/ember.prod.js.map	3.3 MB / 608 kB	-0.38%↓3.3 MB / -0.4%↓605.6 kB
dist/packages/shared-chunks/router-DSi8WnDi.js	55.4 kB / 11.7 kB	-0.19%↓55.3 kB / -1.04%↓11.6 kB
dist/packages/shared-chunks/unrecognized-url-error-BBMMZhBN.js	17.7 kB / 4.5 kB	-7.27%↓16.4 kB / -7.23%↓4.1 kB
types/stable/index.d.ts	44.1 kB / 4.1 kB	-1.72%↓43.3 kB / -1.87%↓4 kB
types/stable/router_js/index.d.ts	554 B / 188 B	—
types/stable/router_js/lib/core.d.ts	282 B / 165 B	—
types/stable/router_js/lib/route-info.d.ts	5.4 kB / 1.2 kB	—
types/stable/router_js/lib/router.d.ts	10.3 kB / 2.4 kB	—
types/stable/router_js/lib/transition-aborted-error.d.ts	611 B / 233 B	—
types/stable/router_js/lib/transition-intent.d.ts	615 B / 227 B	—
types/stable/router_js/lib/transition-intent/named-transition-intent.d.ts	1.8 kB / 486 B	—
types/stable/router_js/lib/transition-intent/url-transition-intent.d.ts	631 B / 222 B	—
types/stable/router_js/lib/transition-state.d.ts	941 B / 331 B	—
types/stable/router_js/lib/transition.d.ts	10.5 kB / 2.4 kB	—
types/stable/router_js/lib/unrecognized-url-error.d.ts	431 B / 159 B	—
types/stable/router_js/lib/utils.d.ts	1.6 kB / 527 B	—
Total (Includes all files)	17.1 MB / 3.2 MB	-0.38%↓17.1 MB / -0.46%↓3.2 MB
Tarball size	3.9 MB	-0.43%↓3.8 MB

_{🤖 This report was automatically generated by pkg-size-action}

[NullVoxPopuli]

browserstack is stable -- trying something else now