unify portal logout url to /user/logout

[nobodyiam]

No description provided.

[nobodyiam]

Fix #1359 when users customized the authentication

[codecov-io]

Codecov Report

Merging #1363 into master will increase coverage by 10.4%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #1363      +/-   ##
============================================
+ Coverage     38.55%   48.96%   +10.4%     
- Complexity      151     1777    +1626     
============================================
  Files            41      372     +331     
  Lines          1092    10645    +9553     
  Branches        138     1105     +967     
============================================
+ Hits            421     5212    +4791     
- Misses          616     5052    +4436     
- Partials         55      381     +326

Impacted Files	Coverage Δ	Complexity Δ
...lo/portal/spi/configuration/AuthConfiguration.java	10.1% <0%> (ø)	1 <0> (?)
...trip/framework/apollo/openapi/entity/Consumer.java	45.83% <0%> (ø)	7% <0%> (?)
...rk/apollo/biz/eureka/ApolloEurekaClientConfig.java	25% <0%> (ø)	1% <0%> (?)
...mework/apollo/portal/component/PortalSettings.java	55% <0%> (ø)	5% <0%> (?)
.../framework/apollo/util/parser/ParserException.java	100% <0%> (ø)	2% <0%> (?)
.../framework/apollo/spring/property/SpringValue.java	100% <0%> (ø)	19% <0%> (?)
...ramework/apollo/openapi/dto/OpenEnvClusterDTO.java	0% <0%> (ø)	0% <0%> (?)
...work/apollo/biz/service/ReleaseHistoryService.java	91.66% <0%> (ø)	5% <0%> (?)
...mework/apollo/portal/entity/vo/EnvClusterInfo.java	0% <0%> (ø)	0% <0%> (?)
...inservice/controller/InstanceConfigController.java	92.4% <0%> (ø)	15% <0%> (?)
... and 322 more

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