Move TextResourceUtil code into CodeExampleUtil in Showcase Common

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: None
• Fix Version/s: liferay-faces-2.1.5-ga6, liferay-faces-2.2.5-ga6, liferay-faces-3.0.5-legacy-ga6, liferay-faces-3.0.5-ga6, liferay-faces-3.1.5-ga6, liferay-faces-3.2.5-ga6, liferay-faces-4.2.5-ga6
• Component/s: Liferay Faces Alloy / Showcase / Tests, Liferay Faces Util
• Labels: None

{markdown}
Because of FACES-2237(https://issues.liferay.com/browse/FACES-2236), `TextResourceUtil` is only used by the showcase now. It's code should be moved directly into `CodeExampleUtil` in showcase-common where it is used.{markdown}