Fix dnf upgrade --allowerasing errors with EPEL packages

Fix 4 errors that occurred when running dnf upgrade --allowerasing on a
system with EPEL KDE packages installed:

1. plasma-discover: Fix typo "sonic-desktop-interface)" -> "sonic-desktop-interface"
   in Requires (stray closing parenthesis in spec)

2. sonic-frameworks-sso: Remove Obsoletes for signon and signon-qt6.
   The SonicDE SSO package provides libsignon-qt6.so.0 while the EPEL
   signon-qt6 provides libsignon-qt6.so.1. Obsoleting signon-qt6 breaks
   accounts-qml-module-qt6 and signon-plugin-oauth2 which need .so.1.
   Both packages can coexist since they install different .so versions.

3. sonic-terminal-tools: Change kdesu dependency from strict version
   match (= 1:6.7.4-3) to >= 1:6.7.4 so it works with any kdesu 6.7.4
   release. Also add Obsoletes for kdesu < 1:6.7.4-2.el10 in the kdesu
   subpackage so it properly replaces the old EPEL kdesu from kde-cli-tools.

4. kamera: Add kamera package with Requires changed from kde-cli-tools
   to sonic-terminal-tools. The EPEL kamera requires kde-cli-tools which
   is obsoleted by sonic-terminal-tools, causing a circular dependency
   resolution failure.

5. skanpage: Change Requires from kquickimageeditor-qt6 (obsoleted by
   sonic-quick-image-editor-qt6) to sonic-quick-image-editor-qt6.

Result: dnf upgrade --allowerasing --best from standard EPEL KDE now
completes with 0 errors and 0 package removals.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

sonic-frameworks-sso/sonic-frameworks-sso.spec

@@ -13,7 +13,7 @@
 #Name:           signon
 Name:           sonic-frameworks-sso
 Version:        8.61.2
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        Accounts framework for Linux and POSIX based platforms
 
 License:        LGPL-2.1-only
@@ -35,7 +35,6 @@ Provides:       signond%{?_isa} = %{version}-%{release}
 Requires:       dbus
 
 Provides:       signon%{?_isa} = %{version}-%{release}
-Obsoletes:      signon < %{version}-%{release}
 
 %description
 Single Sign-On is a framework for centrally storing authentication credentials
@@ -47,7 +46,6 @@ client library for applications to communicate with this system.
 %package qt6
 Summary:        Single Sign On client library for Qt6-based applications
 Provides:       signon-qt6%{?_isa} = %{version}-%{release}
-Obsoletes:      signon-qt6 < %{version}-%{release}
 
 %description qt6
 %{summary}.
@@ -59,9 +57,7 @@ Requires:       %{name}-qt6%{?_isa} = %{version}-%{release}
 # upstream name: signond
 Provides:       signond-devel%{?_isa} = %{version}-%{release}
 Provides:       signon-devel%{?_isa} = %{version}-%{release}
-Obsoletes:      signon-devel < %{version}-%{release}
 Provides:       signon-qt6-devel%{?_isa} = %{version}-%{release}
-Obsoletes:      signon-qt6-devel < %{version}-%{release}
 
 %description devel
 The %{name}-devel package contains libraries and header files for