fix: wait for Generate button to be enabled in Add Database dialog

[adamtheturtle]

Summary

• Wait for the Generate button to be clickable before clicking it in _submit_add_database_dialog. The button is briefly disabled while the dialog revalidates after the VuMark radio is selected, so the previous immediate click was a silent no-op and staleness_of timed out — failing all VuMark tests on the scheduled CI runs. Cloud DB tests passed because the license-dropdown interaction provided enough delay.

Test plan

• test_create_vumark_database_library passes locally
• Scheduled CI run goes green (cloud + license tests already passed; the fix shares the same submission path)

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Note

Low Risk
Low risk change confined to Selenium UI automation; it replaces an immediate click with an explicit clickability wait to avoid timing-related test failures.

Overview
Fixes flaky database creation automation by waiting for the Add Database dialog’s Generate button to become clickable before clicking it.

_submit_add_database_dialog now uses WebDriverWait.until(element_to_be_clickable) (and drops the direct driver.find_element usage), and call sites in create_cloud_database and create_vumark_database are updated to pass only the wait object.

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