Improvements to Profiler Tutorial (backport #711)

[mergify]

Summary

• Requested by @azeey from gz-common: Profiler gazebo_test_cases#1749
• Explicitly create new project directory called profiler_example
• Download profiler.cc into directory using wget
• Remove unnecessary grep dependency
• Clarify the CMakeLists is being created, not modified
• Separate the different options for running the profiler visualization into multiple blocks, with the conditions described more clearly
• Would like confirmation on what IP address http.server broadcasts to; tutorial says it's the container's IP address, but it always showed up as 0.0.0.0 (localhost) for me in my container
• I looked through the contributing guidelines and couldn't find any information on linting tests or formatting standards for these Markdown files, so please point me to them if available!

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers
• Was GenAI used to generate this PR? If so, make sure to add "Generated-by" to your commits. (See this policy for more info.)

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by and Generated-by messages.

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This is an automatic backport of pull request #711 done by Mergify.

[mergify]

Cherry-pick of 2b33445 has failed:

On branch mergify/bp/gz-common6/pr-711
Your branch is up to date with 'origin/gz-common6'.

You are currently cherry-picking commit 2b33445.
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Unmerged paths:
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	both modified:   tutorials/profiler.md

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