Convert maintenance windows to sync windows (#2416)

* Add maintenance windows for applications, configured at the project level

* move maintenance window check out of autoSync(), fix imports and error checking

* fix ui lint

* add some more tests for maintenance

* patch after pre-commit

* Add more tests for maintenance windows

* Remove Dockerfile as it was added by mistake

In openshift clusters, the user id of your container can be arbitrary,
so you need to make the running images compatible with this behavior.

The problematic application for argo-cd was the repo server. When trying
to clone the repos it was getting the error "No user exists for uid
100083000" (100083000 was the random user id being injected by
openshift in my case). This was because the user 100083000 wasn't in the
/etc/passwd file.

The changes in this commit add a uid_entrypoint.sh script that, when the
container starts, modifies the /etc/passwd file to add an entry with the
current UID _only_ if the current UID isn't there.

References:
* Problematic behavior of ssh when user id isn't in the /etc/passwd file:
  https://unix.stackexchange.com/questions/524268/running-git-or-ssh-client-in-docker-as-user-no-user-exists-for-uid
* OpenShift guidelines on how to make your docker image runnable by
  arbitrary user ids:
  https://access.re...

* Issue #2261 - Refactor Helm first class support

* Address code review comments

* Remove unused field from GetAppDetails method

* Move kustomization files back to kustomize 2.0.3

* Dockerize codegen

* Bump Kustomize v2.1.0 to v3.0.0

Issue #1917 - App details page incorrect uses 'requires pruning' icon for out-of-sync resources (#1918)

* Allow Helm parameters to force ambiguously-typed values to be strings

* Fix protobud issue for ForceString field

* Ran pre-commit checks

* Revert "Ran pre-commit checks"

This reverts commit b384d16e46f093fbbbd469d45c7ba65fc35a123a.

* Ran pre-commit checks

* Revert "Ran pre-commit checks"

This reverts commit dc9e31567ba791797c04fc09747caffc4a78c9c2.

* Ran pre-commit checks

* Issue argoproj#1677 - allow users to define application-specific URLs, email addresses, and other info

The recommended labels are the ones described here:
https://kubernetes.io/docs/concepts/overview/working-with-objects/common-labels/
The manifests labels should be in sync with the helm chart
Also this is a follow up after the discussion from:
https://github.com/argoproj/argo-cd/pull/1035

* add service manifest for redis