[QC-953] non-critical tasks

[Barthelemy]

No description provided.

[Barthelemy]

depends on AliceO2Group/AliceO2#11253

[Barthelemy]

• CheckRunners are all non-critical.
• Tasks are critical by default. There is a parameter in the config.
• Mergers are critical if the task they are merging is critical.
• PP: by default critical. Parameter in config.

[ktf]

I just checked this and the topology builds fine now.

[Barthelemy]

After further discussion, we decided that:

• DS is critical
• Tasks are critical by default for the time being, can be marked expendable
• output proxies are the same as the task they attach to
• input proxies are the same as the task they attach to
• mergers are resilient
• checkers are resilient
• aggregators are resilient
• PP tasks are critical by default, can be marked as expendable
• Documentation update

[Barthelemy]

all tests pass now.

[Barthelemy]

needs AliceO2Group/AliceO2#12354

[Barthelemy]

@knopers8 applied the changes