feat(tier4_system_msgs)!: remove old diagnostic graph message

[isamu-takagi]

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autowarefoundation/autoware_universe#8722

Description

Remove old diagnostic graph messages that are no longer in use.

Remarks

None

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[isamu-takagi]

autowarefoundation/autoware_universe#8722 is merged. This PR is ready.

[mitsudome-r]

Note: The messages are already replaced by the new message merged in this PR #113

[mitsudome-r]

LGTM, but we should update autoware.repos to point to a version tag before merging. https://github.com/autowarefoundation/autoware/blob/c9c32480ecff40ce15c0bf7d51a77d67eb981e5e/autoware.repos#L53

[mitsudome-r]

@isamu-takagi Sorry, I had to revert this PR autowarefoundation/autoware#5749 once. We have to update the tag with v0.41.0 and create the version fix PR again.

[isamu-takagi]

@mitsudome-r Can I merge this PR now?

[mitsudome-r]

It should be okay now.