[Addon] refactor fluxcd to use vela-native components

[charlie0129]

Description of your changes

• Deploy Fluxcd controller using webservice, allowing health checks when enabling addon (we can now wait for the controllers to start when enabling addon). More status 'vela addon ls', and add 'vela addon fluxcd log' to check if addon is really started, failed, what is error[Feature] kubevela#3856
• Add parameters to change fluxcd controller images. Making air-gapped installation easier.
• Use cue based templates.

Compatibility:

• Require vela v1.5. This is a breaking change, so we bump addon version to v2.0.0
• Users are able to upgrade fluxcd from previous addon versions.
• Existing e2e test makefiles in KubeVela will continue to work. (make e2e-setup use labels to wait for fluxcd to be ready. These labels are kept.)

Fixes kubevela/kubevela#3856

How has this code been tested?

Checklist

I have:

• Title of the PR starts with type (e.g. [Addon] , [example] or [Doc]).
• Updated/Added any relevant documentation and examples.
• New addon should be put in experimental.
• Update addon should modify the version in metadata.yaml to generate a new version.
• Any changes about verified addons should be tested with CI script.

[wangyikewxgm]

Discussed with @Somefive , let's use webservice component. Worker is stale.

[charlie0129]

Refactored with webservice components

[wangyikewxgm]

LGTM，great job