feat: add hasAttribute(name) for attribute presence assertions

[JAYA DILEEP (seethinajayadileep)]

Fixes #1844

Summary

Adds LocatorAssertions.hasAttribute(String name) and an options overload so callers can assert attribute presence / absence (via .not()), matching Node's presence-only toHaveAttribute(name).

Changes

• Interface LocatorAssertions: hasAttribute(name) + hasAttribute(name, HasAttributeOptions)
• Impl LocatorAssertionsImpl: expectImpl("to.have.attribute", ...) with expressionArg = name (value assertions continue to use to.have.attribute.value)
• Tests: presence pass + fail, and .not() absence pass + fail

Notes

• ApiGenerator already special-cases the HasAttributeOptions null cast for LocatorAssertions.hasAttribute overloads.
• LocatorAssertions is regenerated from upstream API docs; lasting inclusion after driver rolls needs the optional value param marked for Java in upstream docs/src/api/class-locatorassertions.md (today that optional overload is langs: python only), then a regenerate.

[JAYA DILEEP (seethinajayadileep)]

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[Yury Semikhatsky (yury-s)]

This file is generated from the upstream definitions. You need to update LocatorAssertions.toHaveAttribute#2 definition upstream to include java in the filter. Once that change is rolled to this repo, the interface will get the method and you just need to update the implementation and add a test.

[JAYA DILEEP (seethinajayadileep)]

Opened upstream docs PR microsoft/playwright#42710 to enable java on toHaveAttribute#2. Removed the hand-edited generated LocatorAssertions.java from this PR; left implementation + tests. Will regenerate the interface once that rolls.