Use unique commands for all container components when initializing ssh agent

[AObuchow]

Description

In a devworkspace with multiple container components, multiple commands with the same id init-ssh-agent are added that target each container component. The devfile specification requires all commands to have unique ids.

As a result, the init-ssh-agent postStart event won't actually run for all container components, which will result in the ssh passphrase not automatically being inputed on the user's behalf in certain cases.

Additional context

Related upstream issue