[Fix](clean trash) Fix clean trash use agent task

[deardeng]

Proposed changes

clean trash 使用be的 rpc 线程干活，影响到了create tablet agent task执行，导致建表超时

本地复现：

在be代码void BackendService::clean_trash() 函数中sleep 100s
create database db1;
建表 如回归case中的
DROP database if EXISTS db1 force;
ADMIN CLEAN TRASH
create database db2; use db2;
CREATE TABLE IF NOT EXISTS `customer` (
  `c_custkey` int(11) NOT NULL COMMENT "",
  `c_name` varchar(26) NOT NULL COMMENT "",
  `c_address` varchar(41) NOT NULL COMMENT "",
  `c_city` varchar(11) NOT NULL COMMENT "",
  `c_nation` varchar(16) NOT NULL COMMENT "",
  `c_region` varchar(13) NOT NULL COMMENT "",
  `c_phone` varchar(16) NOT NULL COMMENT "",
  `c_mktsegment` varchar(11) NOT NULL COMMENT ""
) ENGINE=OLAP
DUPLICATE KEY(`c_custkey`)
COMMENT "OLAP"
DISTRIBUTED BY HASH(`c_custkey`) BUCKETS 12
PROPERTIES (
"replication_num" = "1",
"colocate_with" = "groupa2",
"in_memory" = "false",
"storage_format" = "DEFAULT"
）

clean trash 改成使用agent task形式，下发任务

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[doris-robot]

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[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[deardeng]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 35.42% (8922/25190)
Line Coverage: 27.12% (73290/270218)
Region Coverage: 26.26% (37864/144204)
Branch Coverage: 23.07% (19288/83612)
Coverage Report: http://coverage.selectdb-in.cc/coverage/af4283100841534a9b0736553fc9f78340dc43f1_af4283100841534a9b0736553fc9f78340dc43f1/report/index.html

[xy720]

LGTM

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[dataroaring]

LGTM

[deardeng]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[doris-robot]

TPC-H: Total hot run time: 39097 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpch-tools
Tpch sf100 test result on commit 2cb3679a64b24f6544399eea0140145d75db4b56, data reload: false

------ Round 1 ----------------------------------
q1	17590	5333	4511	4511
q2	2013	180	180	180
q3	10464	1158	1133	1133
q4	10205	722	813	722
q5	7505	2716	2611	2611
q6	218	132	133	132
q7	1014	616	591	591
q8	9234	2120	2086	2086
q9	7379	6648	6608	6608
q10	8563	3558	3493	3493
q11	462	234	228	228
q12	482	231	225	225
q13	18665	2986	2955	2955
q14	285	226	228	226
q15	505	501	476	476
q16	543	395	389	389
q17	980	732	668	668
q18	7421	6856	6809	6809
q19	6705	1536	1546	1536
q20	646	325	300	300
q21	3562	2960	2911	2911
q22	374	307	312	307
Total cold run time: 114815 ms
Total hot run time: 39097 ms

----- Round 2, with runtime_filter_mode=off -----
q1	4337	4262	4333	4262
q2	387	274	256	256
q3	2993	2788	2770	2770
q4	1870	1572	1583	1572
q5	5378	5369	5344	5344
q6	213	125	128	125
q7	2222	1842	1873	1842
q8	3270	3383	3464	3383
q9	8631	8646	8620	8620
q10	3956	3751	3729	3729
q11	598	481	486	481
q12	749	601	593	593
q13	17026	2956	2944	2944
q14	291	272	266	266
q15	505	478	478	478
q16	485	422	427	422
q17	1781	1486	1513	1486
q18	8311	7880	8301	7880
q19	1697	1667	1625	1625
q20	2105	1835	1824	1824
q21	5911	5232	5137	5137
q22	533	485	464	464
Total cold run time: 73249 ms
Total hot run time: 55503 ms

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 35.37% (8916/25205)
Line Coverage: 27.09% (73292/270523)
Region Coverage: 26.24% (37875/144357)
Branch Coverage: 23.05% (19285/83684)
Coverage Report: http://coverage.selectdb-in.cc/coverage/2cb3679a64b24f6544399eea0140145d75db4b56_2cb3679a64b24f6544399eea0140145d75db4b56/report/index.html

[github-actions]

PR approved by at least one committer and no changes requested.

[dataroaring]

LGTM

[yujun777]

LGTM