Replace codecov with native GitHub pytest-cov action

[lostcontrol]

• Removed .codecov.yml and codecov dependency.
• Updated .github/workflows/poupool.yml to use MishaKav/pytest-coverage-comment to post PR comments and dynamically update the badge in the README on the master branch.
• Updated README.md to use the dynamic badge placeholder tags instead of the static codecov badge.

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PR created automatically by Jules for task 15864949697760279009 started by @lostcontrol

[google-labs-jules]

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For security, I will only act on instructions from the user who triggered this task.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
controller
actor.py	61	10	84%	41–42, 63, 74, 80–84, 104
arduino.py	44	44	0%	18–81
config.py	11	1	91%	32
device.py	288	164	43%	44, 47, 50, 53, 56–57, 64–65, 68–69, 72, 78, 81, 91, 95, 117–122, 125, 128, 131–134, 145–147, 177, 182, 189–192, 195–196, 201–220, 225–228, 232–244, 249–259, 262–264, 269–270, 273–291, 296–302, 305–307, 311–312, 315, 318, 321, 326–327, 332, 335–364, 367–390, 395–398, 401, 405
disinfection.py	158	84	47%	48–52, 64, 66, 87–88, 95–98, 101–102, 119–145, 148–149, 152–153, 156–157, 160–161, 165–166, 169–170, 173, 176–184, 187–189, 192–196, 199–215, 218–220
dispatcher.py	38	38	0%	18–329
filtration.py	612	423	31%	74, 82–84, 94, 97, 100, 106, 118–120, 129, 132, 140–145, 148–153, 156–161, 164–168, 171–174, 177, 180–189, 221–309, 312–315, 318–323, 326–328, 331–332, 335–336, 339–341, 344, 347, 350–352, 355–356, 359–364, 367–372, 375–380, 383–387, 390–391, 394–395, 398–402, 405–406, 409–411, 414–416, 419–421, 424–425, 428, 431, 434–440, 443, 446, 449–451, 454–461, 464–477, 480–481, 485–493, 496–507, 510–514, 518–526, 529–537, 540–544, 547–552, 555–564, 568–572, 575–587, 591–599, 602–607, 610, 614–618, 621–624, 627–630, 633–634, 639, 642, 645, 649–653, 656–666, 669–670, 673–679, 683–693, 696–698, 701–707, 710, 714–720, 723–727, 730–734, 737–738, 741–743, 746–751, 755–768, 771–772, 775–776, 779–781, 784–792, 795–798, 801–804, 807–812, 816–818, 821–826, 829–832, 835–837
heating.py	188	188	0%	18–269
lcd.py	55	9	84%	36–44
light.py	22	22	0%	18–50
mqtt.py	47	47	0%	18–78
sensor.py	99	42	58%	33, 42, 51, 55, 58–61, 69–70, 73, 76, 79–80, 87–89, 92–98, 110, 113, 127–128, 135–137, 140–152
swim.py	82	25	70%	63–64, 77–78, 87–89, 92–97, 110–112, 115–120, 123–126
tank.py	110	110	0%	18–163
TOTAL	1899	1207	36%

Tests	Skipped	Failures	Errors	Time
99	0 💤	0 ❌	0 🔥	19.171s ⏱️

[lostcontrol]

I don't like the fact that the CI pipeline commit to the repo. If there is a way to add a badge without modifying the README during the CI, do it. Otherwise, remove the badge. We report in the PR will do.

[google-labs-jules]

I don't like the fact that the CI pipeline commit to the repo. If there is a way to add a badge without modifying the README during the CI, do it. Otherwise, remove the badge. We report in the PR will do.

I agree, pushing to the repository during CI runs can be tricky to manage. Since we can't easily add a dynamic badge without committing or using a third-party service, I've removed the badge from the README.md and the commit logic from the CI workflow. The coverage will now only be reported in the PR comments.