Username field is auto poppulated with the subject claim from Fed Auth during JIT with consented username and password flow

[LahiruLS]

Describe the issue:
Username field is auto poppulated with the subject claim from Fed Auth during JIT with consented username and password flow

How to reproduce:

1. Setup an FedIDP, we uses UAEPASS where the sub claim is a UUID
2. Enable JIT with consented username and password flow from console app for the connector.
3. Now try the flow.
4. When the page where it asked to fill the username the UUID is auto filling the field. This auto poppulated value can be changed by changing the Subject attribute from the connection. However If we change that the association ID and lot more will be changed accordingly. Hence the customer do not wants to change the subject claim from the connecion and needs to keep the UUID as the subject. This is required to keep consistancy between UAEPASS IDP and WSO2 IDP.

Expected behavior:
The expectation is that this field to be empty.

Environment information (Please complete the following information; remove any unnecessary fields) :

• Product Version: 7.0.0
• OS: Any
• Database: Oracle 19
• Userstore: JDBC

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