Update todo illustrations

What does this MR do and why?

Update todo illustrations based on new brand style.

Issue to audit illustrations on todo page — https://gitlab.com/gitlab-org/gitlab/-/issues/358512

New illustrations issues — gitlab-svgs#358 (closed), gitlab-svgs#357 (closed)

Screenshots or screen recordings

before after

How to set up and validate locally

  1. Go to Todo page

  2. See the first illustration

  3. Go to any issue and tag yourself in the comments

  4. Go to Todo page

  5. Check mention as done

  6. Reload page

  7. See second illustartion

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #358512

Merge request reports

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