[DRAFT] Traces sampler env var follow-up PR

[shayyxi]

• I added CHANGELOG entry for this change.
• Change is not relevant to the end user.

Changes

Verification

[shayyxi]

This is a follow-up PR to address the review comments in the following merged PR:
#6306

[stale]

Hello 👋 Looks like there was no activity on this amazing PR for the last 30 days.
Do you mind updating us on the status? Is there anything we can help with? If you plan to still work on it, just comment on this PR or push a commit. Thanks! 🤗
If there will be no activity in the next week, this issue will be closed (we can always reopen a PR if you get back to this!). Alternatively, use remind command if you wish to be reminded at some point in future.

[shayyxi]

I will resume work on it from next week.