Should chapter introduction and conclusion be included in the table of contents?
The overriding response here has to be "consult your supervisor, or any documentation that you university says on how they want things to be formatted".

However, if neither of those gives useful information, I would simply include them if you are including other headings at the same level. So if each chapter has multiple sections of which the introduction and conclusions are examples, I would format them the same as other sections and include all of the sections in the ToC.