chore(profiler): delete unused region tag "hotapp"

[OremGLG]

Description

Delete unused region tag "hotapp" at profiler/hotapp/main.go

Fixes Internal:
b/347348201

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Checklist

• I have followed [Contributing Guidelines from CONTRIBUTING.MD]
• Code formatted: gofmt (see Formatting)
• Vetting pass: go vet (see Formatting)
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to delete 1 region tag.

• profiler/hotapp/main.go:15, tag hotapp

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