Do not remove totaltime instrumentation from queryDesc

[Green-Chan]

Previous approach could have caused problems with other extensions that are using queryDesc->totaltime during query execution. Use another way to count the time used before postgres' executor.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 62.97%. Comparing base (5deaf9a) to head (6e35220).

:exclamation: There is a different number of reports uploaded between BASE (5deaf9a) and HEAD (6e35220). Click for more details.

HEAD has 77 uploads less than BASE

Flag	BASE (5deaf9a)	HEAD (6e35220)
17_regress_check-pytest	1	0
16_regress_check-pytest	1	0
15_citus_upgrade	1	0
15_regress_check-pytest	1	0
15_17_upgrade	1	0
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16_regress_check-follower-cluster	1	0
15_regress_check-columnar-isolation	1	0
16_regress_check-columnar-isolation	1	0
17_regress_check-follower-cluster	1	0
15_regress_check-follower-cluster	1	0
17_regress_check-columnar-isolation	1	0
16_17_upgrade	1	0
15_regress_check-columnar	1	0
16_regress_check-query-generator	1	0
15_regress_check-enterprise-isolation-logicalrep-2	1	0
16_regress_check-enterprise-isolation-logicalrep-3	1	0
16_regress_check-enterprise-isolation-logicalrep-2	1	0
17_regress_check-columnar	1	0
15_regress_check-split	1	0
17_regress_check-enterprise-isolation-logicalrep-3	1	0
17_regress_check-enterprise-isolation-logicalrep-2	1	0
16_regress_check-columnar	1	0
16_regress_check-enterprise-failure	1	0
15_regress_check-enterprise-failure	1	0
15_regress_check-query-generator	1	0
15_regress_check-enterprise-isolation-logicalrep-3	1	0
15_regress_check-enterprise-isolation-logicalrep-1	1	0
17_regress_check-enterprise-isolation-logicalrep-1	1	0
15_arbitrary_configs_3	1	0
16_cdc_installcheck	1	0
17_cdc_installcheck	1	0
15_cdc_installcheck	1	0
17_regress_check-operations	1	0
15_regress_check-operations	1	0
16_arbitrary_configs_5	1	0
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16_arbitrary_configs_2	1	0
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16_regress_check-multi	1	0
17_regress_check-multi	1	0
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16_regress_check-multi-1	1	0
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16_arbitrary_configs_4	1	0
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16_regress_check-split	1	0
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16_arbitrary_configs_3	1	0
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16_regress_check-enterprise-isolation	1	0
15_regress_check-enterprise-isolation	1	0
16_arbitrary_configs_1	1	0
17_arbitrary_configs_1	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #8029       +/-   ##
===========================================
- Coverage   89.19%   62.97%   -26.23%     
===========================================
  Files         284      284               
  Lines       61515    61289      -226     
  Branches     7696     7641       -55     
===========================================
- Hits        54871    38594    -16277     
- Misses       4440    19855    +15415     
- Partials     2204     2840      +636     

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