Support disabling the LiveState feature

[t-kikuc]

What would you like to be added:

• Support disabling the LiveState feature for a platform-provider.
  • e.g. Add enableLiveState: true/false flag in PlatformProviderLambdaConfig.

Why is this needed:

• For those who don't need DriftDetection and LiveState UI, the LiveState feature is not necessary.
• LiveState feature calls a lot of APIs (e.g. AWS, GCP, etc.), but it would lead to higher cost.
  • Especially, the number of API calls tends to be higher for function platforms like Lambda/CloudRun.

[t-kikuc]

💡 An idea of implementation is like this: https://github.com/pipe-cd/pipecd/commit/82988086a99232d6908a7d1ce245ffa7629750ac

[khanhtc1202]

I think the configuration for features like livestate or drift detection to be on/off should belong to application configuration instead of piped platform provider or plugin config since users may use the same platform/plugin config of piped to manage various applications with different attentions, wdyt? 🤔

[t-kikuc]

Disabling LiveState&DriftDetection for each app does not have an effect on reducing API calls. Even if LiveState of only one app is enabled, livestatestore will fetch all resources.

[ffjlabo]

FYI, it seems that there was a similar issue with disabling drift detection: https://github.com/pipe-cd/pipecd/issues/4508. This is implemented as a temporary option for the terraform provider in the piped config. https://pipecd.dev/docs-v0.49.x/user-guide/managing-piped/configuration-reference/#platformproviderterraformconfig

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