refactor(cronjobs): migrate tor_exit_nodes and whatsmyip to HttpClient. Refs #1214

[Prasad8830]

Description

This PR handles Step 2 of standardizing our cronjobs HTTP client as discussed in #1214.

It migrates the tor_exit_nodes and whatsmyip fetchers to utilize the new HttpClient wrapper introduced in #<insert_first_pr_number_here>. This replaces ad-hoc requests.get calls with the shared client wrapper, ensuring standardized 10-second timeouts, consistent HTTPError raising, and automatic retries for rate limits and server errors.

Related issues

• Refs Standardize cronjob HTTP fetchers with a shared client wrapper #1214
• Depends on #<insert_first_pr_number_here>

Type of change

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Chore (refactoring, dependency updates, CI/CD changes, code cleanup, docs-only changes).

Checklist

Formalities

• I have read and understood the rules about how to Contribute to this project.
• I chose an appropriate title for the pull request in the form: <feature name>. Closes #999
• My branch is based on develop (via the wrapper branch).
• The pull request is for the branch develop.
• I have reviewed and verified any LLM-generated code included in this PR.

Docs and tests

• I documented my code changes with docstrings and/or comments.
• I have checked if my changes affect user-facing behavior that is described in the docs. If so, I also included an update to the wiki in the description of this PR.
• Linter (Ruff) gave 0 errors. If you have correctly installed pre-commit, it does these checks and adjustments on your behalf.
• I have added tests for the feature/bug I solved.
• All the tests gave 0 errors.

GUI changes

Ignore this section if you did not make any changes to the GUI.

• I have provided a screenshot of the result in the PR.
• I have created new frontend tests for the new component or updated existing ones.