feat: e2e add dynamic custom config

[veezhang]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

[veezhang]

There are still two issues(#353 #354) that need to be dealt with, and the dynamic custom config have not been passed yet.
The static custom config have been passed.

--- PASS: TestNebulaCluster (281.51s)
    --- SKIP: TestNebulaCluster/scale_with_default_values (0.00s)
    --- SKIP: TestNebulaCluster/update_version (0.00s)
    --- SKIP: TestNebulaCluster/update_resources (0.00s)
    --- PASS: TestNebulaCluster/custom_config_for_static (281.51s)
        --- PASS: TestNebulaCluster/custom_config_for_static/Install_NebulaCluster (1.03s)
        --- PASS: TestNebulaCluster/custom_config_for_static/Wait_NebulaCluster_to_be_ready (70.10s)
        --- PASS: TestNebulaCluster/custom_config_for_static/Upgrade_NebulaCluster_update_configs (1.12s)
        --- PASS: TestNebulaCluster/custom_config_for_static/Wait_NebulaCluster_to_be_ready_after_upgrade_update_configs (156.39s)
        --- PASS: TestNebulaCluster/custom_config_for_static/Upgrade_NebulaCluster_restart_pods (0.22s)
        --- PASS: TestNebulaCluster/custom_config_for_static/Wait_NebulaCluster_to_be_ready_after_upgrade_restart_pods (51.39s)
        --- PASS: TestNebulaCluster/custom_config_for_static/Uninstall_NebulaCluster (1.13s)
    --- SKIP: TestNebulaCluster/custom_config_for_dynamic (0.00s)
PASS

[MegaByte875]

LGTM