Fix icon and textfield in incident timeline

What does this MR do and why?

Describe in detail what your merge request does and why. This change will improve the user experience by fixing the squished icon and the incorrect size of the text field. This change will make sure that icon and text field should display correctly. This change is important to ensure that the user has a good experience with the incident timeline and can see and understand the content easily.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

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MR acceptance checklist

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

• I have evaluated the MR acceptance checklist for this MR.

Related to #389309 (closed)