clean server factory context and partly revert #29289 #31458
Merged
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Commit Message: clean server factory context and partly revert #29289
Additional Description:
#29289 added ECDS support to the composite filter which is great. But it also introduced a new method to the server factory context which is not recommended.
SingletonManager is better choice to achieve this target. If more stable lifetime is necessary, then a pinned singleton instance should be enough.
Risk Level: low.
Testing: n/a.
Docs Changes: n/a.
Release Notes: n/a.
Platform Specific Features: n/a.