fix: Add hardcoded ETH price feed ID for Pyth as stop-gap solution (#831)

* fix: Add hardcoded ETH price feed ID for Pyth as stop-gap solution

- Added hardcoded price feed ID for ETH (0xff61491a931112ddf1bd8147cd1b641375f79f5825126d665480874634fd0ace)
- This is a temporary stop-gap solution until proper new API link is provided after talking to the Pyth team
- Updated both Python and TypeScript implementations

* fix: Apply linting fixes for Pyth action provider

- Remove trailing whitespace from blank lines in both Python and TypeScript files
- Fixes ruff and prettier formatting issues

* fix: Update Pyth tests to reflect ETH hardcoded price feed ID

- Changed test that expected ETH to throw error to use SOL instead
- Added new test to verify ETH returns hardcoded price feed ID
- Tests now properly reflect the stop-gap solution behavior

* fix: Apply prettier formatting to Pyth test file

- Added trailing comma and line breaks for long string in test
- Fixes eslint/prettier formatting requirements

* changelog