<!--A few plain bullets saying what changed and why, for a reviewer
skimming it - not a wall of text, not a restatement of the diff, not
generated boilerplate.-->
#### Description
AWS Cloud Integration's Lambda dashboard was missing FunctionName
variable, this PR adds that variable for better UX.
<!--Reference issues using `Closes #issue-number` to enable automatic
closure on merge. -->
#### Issues closed by this PR
Closes https://github.com/SigNoz/platform-pod/issues/2988
<!--If applicable, include screenshots or screen recordings that clearly
show the behavior before the change and the result after the change. -->
#### Screenshots / Screen Recordings
<img width="1503" height="815" alt="image"
src="https://github.com/user-attachments/assets/56203f8d-1f06-4c39-b3c1-c1dabf028045"
/>
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Co-authored-by: Vikrant Gupta <vikrant@signoz.io>
