Fix HTML email not rendering correctly

[nvuillam]

Fixes #2120
Set REPORTERS_MARKDOWN_TYPE to simple to avoid external images in PR/MR markdown comments.

[nvuillam]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ BASH	bash-exec	7		0	0.01s
✅ BASH	shellcheck	7		0	0.37s
✅ BASH	shfmt	7	0	0	0.33s
✅ COPYPASTE	jscpd	yes		no	2.3s
✅ DOCKERFILE	hadolint	105		0	9.92s
✅ JSON	eslint-plugin-jsonc	21	0	0	1.92s
✅ JSON	jsonlint	19		0	0.21s
✅ JSON	v8r	21		0	14.2s
⚠️ MARKDOWN	markdownlint	297	0	11	5.18s
✅ MARKDOWN	markdown-link-check	297		0	4.58s
✅ MARKDOWN	markdown-table-formatter	297	0	0	14.19s
✅ OPENAPI	spectral	1		0	0.7s
⚠️ PYTHON	bandit	171		43	2.28s
✅ PYTHON	black	171	0	0	4.06s
✅ PYTHON	flake8	171		0	1.91s
✅ PYTHON	isort	171	0	0	0.7s
✅ PYTHON	mypy	171		0	6.56s
✅ PYTHON	pylint	171		0	10.52s
⚠️ PYTHON	pyright	171		274	16.53s
✅ REPOSITORY	checkov	yes		no	25.67s
✅ REPOSITORY	git_diff	yes		no	0.35s
✅ REPOSITORY	secretlint	yes		no	5.81s
✅ REPOSITORY	trivy	yes		no	24.69s
✅ SPELL	cspell	712		0	17.01s
✅ SPELL	misspell	536	0	0	0.78s
✅ XML	xmllint	3		0	0.0s
✅ YAML	prettier	80	0	0	2.71s
✅ YAML	v8r	22		0	42.46s
✅ YAML	yamllint	81		0	1.47s

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[nvuillam]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ BASH	bash-exec	7		0	0.02s
✅ BASH	shellcheck	7		0	0.49s
✅ BASH	shfmt	7	0	0	0.04s
✅ COPYPASTE	jscpd	yes		no	2.88s
✅ DOCKERFILE	hadolint	105		0	12.1s
✅ JSON	eslint-plugin-jsonc	21	0	0	2.18s
✅ JSON	jsonlint	19		0	0.24s
✅ JSON	v8r	21		0	17.52s
⚠️ MARKDOWN	markdownlint	297	2	11	6.26s
✅ MARKDOWN	markdown-link-check	297		0	5.58s
✅ MARKDOWN	markdown-table-formatter	297	2	0	20.23s
✅ OPENAPI	spectral	1		0	0.92s
⚠️ PYTHON	bandit	171		43	2.76s
✅ PYTHON	black	171	0	0	4.17s
✅ PYTHON	flake8	171		0	2.3s
✅ PYTHON	isort	171	0	0	0.49s
✅ PYTHON	mypy	171		0	8.48s
✅ PYTHON	pylint	171		0	13.67s
⚠️ PYTHON	pyright	171		272	20.77s
✅ REPOSITORY	checkov	yes		no	31.51s
⚠️ REPOSITORY	devskim	yes		60	1.26s
✅ REPOSITORY	dustilock	yes		no	1.18s
✅ REPOSITORY	git_diff	yes		no	0.04s
✅ REPOSITORY	secretlint	yes		no	4.8s
✅ REPOSITORY	syft	yes		no	3.16s
✅ REPOSITORY	trivy	yes		no	23.06s
✅ SPELL	cspell	712		0	21.64s
✅ SPELL	misspell	536	2	0	0.51s
✅ XML	xmllint	3		0	0.0s
✅ YAML	prettier	80	0	0	2.92s
✅ YAML	v8r	22		0	51.49s
✅ YAML	yamllint	81		0	1.57s

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