Add option to disable es5 bundle generation in build on CI

[neilhem]

🚀 Feature request

Command (mark with an x)

- [ ] new
- [x] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Description

A clear and concise description of the problem or missing capability...

Add option to fully disable es5 generation in such scenarios like CI environment passing some option ng build --disable-es5-bundle=true

Describe the solution you'd like

If you have a solution in mind, please describe it.

Describe alternatives you've considered

Have you considered any alternative solutions or workarounds?

ref #14679

[alan-agius4]

Duplicate of #14602

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