Add test for configure and fix flaky tests

[vshanthe]

📝 Description

Test for configure and fix flaky tests

✔️ How to Test

make test-int TEST_CASE=test_account.py
make test-int TEST_CASE=test_clusters.py
make test-int TEST_CASE=test_ssh.py

[Copilot]

Pull request overview

This PR adds a smoke test for the configure command and fixes flaky integration tests by adding proper retry logic and correcting test assertions. The changes improve test reliability by handling transient SSH connection issues and fixing incorrect header validation in the LKE node view test.

Changes:

• Added retry logic with 10 attempts for SSH connectivity test to handle transient failures
• Fixed incorrect header assertions in LKE node view test (split malformed string into proper header list and added missing pool_id)
• Added smoke test for linode-cli configure --help command

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
tests/integration/ssh/test_ssh.py	Added subprocess import, .strip() calls for consistency, and retry logic for flaky SSH connectivity test
tests/integration/lke/test_clusters.py	Fixed malformed header list in test_view_node from single concatenated string to proper list with pool_id
tests/integration/account/test_account.py	Added smoke test for configure command help output

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