Adjust mermaid graph expansion calculation

Robert Marshallrequested to merge
368393-account-for-per-graph-and-all-graph-mermaid-character-render-counts into master

What does this MR do and why?

Adjust mermaid graph expansion calculation

- Mermaid blocks and total size per block calculate in such a way that
  small charts tightly styled will trip over the 2,000 character limit.
  This change alters the logic to allow more characters in a single
  graph and caps the total rendered characters across all graphs.

Related https://gitlab.com/gitlab-org/gitlab/-/issues/368393

Signed-off-by: Robert Marshall <rmarshall@gitlab.com>

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Related Mermaid apply MAX_CHAR_LIMIT to each diagram in... (#368393) • Unassigned • Backlog

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