bugFix:unified the width of all instance related field to be 128.

[lunescode]

What is the purpose of the change

Iin table linkis_cg_manager_service_instance and table linkis_cg_manager_service_instance_metrics, 'instance' is 128,but in linkis_ps_instance_label_relation(service_instance)、linkis_cg_manager_label_service_instance(service_instance)、linkis_cg_manager_engine_em(engine_instance、em_instance) is 64.
if hostname use fqdn, then length will longer than 64,such as 'linkis-cg-engineconnmanager-0.linkis-svc.default.svc.cluster.local'

Brief change log

• modify linkis_ps_instance_label_relation(service_instance) 64->128 ;
• modify linkis_cg_manager_label_service_instance(service_instance) 64->128;
• modify linkis_cg_manager_engine_em(engine_instance、em_instance) 64->128;

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• Anything that affects deployment: ( no )
• The MGS(Microservice Governance Services), i.e., Spring Cloud Gateway, OpenFeign, Eureka.: ( no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)

[peacewong]

LGTM.