autoscaler: Allow customization of taskscaler and fleeting parameters in config.toml
## Description Both `taskscaler` and `fleeting` have internal configuration options that are not currently exposed to users for customization. ## Proposal Expose internal configuration parameters such as `DeletionRetryInterval`, `FailureThreshold`, `ShutdownDeletionInterval`, and `ShutdownDeletionRetries` as configurable options in config.toml. This would allow administrators to fine-tune these values based on their specific needs or infrastructure requirements. ## Links to related issues and merge requests / references [fleeting: options.go](https://gitlab.com/gitlab-org/fleeting/fleeting/-/blob/main/options.go)
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