Use relative URLs in scan-manager webapp UI

[ayomawdb]

Description:
Currently scan-manager webapplication UI has relative URLs that starts with "/" which restrict the application to a one fixed context.

Example:

security-tools/internal/scan-manager/webapp/src/main/webapp/WEB-INF/views/scan-manager/index.jsp

Line 38 in 4369690

<a class="btn btn-primary scan-manager-index-page-button" href="/scan-manager/scanners"

Example:

security-tools/internal/scan-manager/webapp/src/main/webapp/WEB-INF/views/scan-manager/scans.jsp

Line 112 in 4369690

<form action="/scan-manager/stop" method="post"

Due to this we cannot map the internal domain (https://example.wso2.com/) to the application through the reverse-proxy. Instead the context should also be appended to access the application (https://example.wso2.com/scan-manager/).

As a fix, the application should use relative URLs that are not starting with a "/" in all situations, to avoid having to restrict to a fixed context.

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