fix: page stats does not subscribe in finder

[guqing]

What type of PR is this?

/kind bug
/area core

What this PR does / why we need it:

修复自定义页面 Finder 中 getByName 方法没有返回访问量的问题
此问题为重构 #2918 时引入。

Which issue(s) this PR fixes:

Fixes #2992

Special notes for your reviewer:

/cc @halo-dev/sig-halo

Does this PR introduce a user-facing change?

None

[JohnNiang]

/cherry-pick release-2.0

[halo-dev-bot]

@JohnNiang: once the present PR merges, I will cherry-pick it on top of release-2.0 in a new PR and assign it to you.

In response to this:

/cherry-pick release-2.0

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[JohnNiang]

It works very well.

/approve

[ruibaby]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang, ruibaby

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• OWNERS [JohnNiang,ruibaby]

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[halo-dev-bot]

@JohnNiang: #3003 failed to apply on top of branch "release-2.0":

Applying: fix: page stats does not subscribe in finder
Using index info to reconstruct a base tree...
M	src/main/java/run/halo/app/theme/finders/impl/SinglePageFinderImpl.java
Falling back to patching base and 3-way merge...
Auto-merging src/main/java/run/halo/app/theme/finders/impl/SinglePageFinderImpl.java
CONFLICT (content): Merge conflict in src/main/java/run/halo/app/theme/finders/impl/SinglePageFinderImpl.java
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 fix: page stats does not subscribe in finder
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-2.0

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[JohnNiang]

由于该问题在 Halo 2.0.x 中没有问题，我们不再 cherry pick 到 release-2.0 分支中。